Dex Format Error?

Hello, I just recently setup Chartboost and when I went to build it, it gave me this errors?

CommandInvokationFailure: Unable to convert classes into dex format.
C:\Program Files\Java\jdk1.8.0_121\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/rielm/AppData/Local/Android/sdk	ools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -

stderr[
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin$1;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin$2;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin$3;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin$4;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin$5;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin$6;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin$7;
Uncaught translation error: java.lang.IllegalArgumentException: already added: Lcom/chartboost/sdk/unity/CBPlugin$8;

UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.RuntimeException: Translation has been interrupted
	at com.android.dx.command.dexer.Main.processAllFiles(Main.java:613)
	at com.android.dx.command.dexer.Main.runMonoDex(Main.java:311)
	at com.android.dx.command.dexer.Main.run(Main.java:277)
	at com.android.dx.command.dexer.Main.main(Main.java:245)
	at com.android.dx.command.Main.main(Main.java:106)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at SDKMain.main(SDKMain.java:129)
Caused by: java.lang.InterruptedException: Too many errors
	at com.android.dx.command.dexer.Main.processAllFiles(Main.java:605)
	... 9 more
]
stdout[
processing archive C:\Users\rielm\OneDrive\Documents\Project M3\Temp\StagingArea\android-libraries\ChartboostSDK\libs\.\android_bridge.jar...
ignored resource META-INF/
ignored resource META-INF/MANIFEST.MF
ignored resource com/
ignored resource com/chartboost/
ignored resource com/chartboost/sdk/
ignored resource com/chartboost/sdk/unity/
processing com/chartboost/sdk/unity/CBPlugin.class...
processing com/chartboost/sdk/unity/CBPlugin$1.class...
processing com/chartboost/sdk/unity/CBPlugin$2.class...
processing com/chartboost/sdk/unity/CBPlugin$3.class...
processing com/chartboost/sdk/unity/CBPlugin$4.class...
processing com/chartboost/sdk/unity/CBPlugin$5.class...
processing com/chartboost/sdk/unity/CBPlugin$6.class...
processing com/chartboost/sdk/unity/CBPlugin$7.class...
processing com/chartboost/sdk/unity/CBPlugin$8.class...
processing com/chartboost/sdk/unity/CBPlugin$9.class...
processing archive C:\Users\rielm\OneDrive\Documents\Project M3\Temp\StagingArea\android-libraries\ChartboostSDK\libs\.\chartboost.jar...
ignored resource META-INF/MANIFEST.MF
processing com/chartboost/sdk/CBImpressionActivity.class...
processing com/chartboost/sdk/CBImpressionActivity$1.class...
processing com/chartboost/sdk/CBImpressionActivity$2.class...
processing com/chartboost/sdk/CBLocation.class...
processing com/chartboost/sdk/Chartboost.class...
processing com/chartboost/sdk/Chartboost$1.class...
processing com/chartboost/sdk/Chartboost$10.class...
processing com/chartboost/sdk/Chartboost$1$1.class...
processing com/chartboost/sdk/Chartboost$11.class...
processing com/chartboost/sdk/Chartboost$12.class...
processing com/chartboost/sdk/Chartboost$13.class...
processing com/chartboost/sdk/Chartboost$14.class...
processing com/chartboost/sdk/Chartboost$15.class...
processing com/chartboost/sdk/Chartboost$16.class...
processing com/chartboost/sdk/Chartboost$17.class...
processing com/chartboost/sdk/Chartboost$18.class...
processing com/chartboost/sdk/Chartboost$19.class...
processing com/chartboost/sdk/Chartboost$2.class...
processing com/chartboost/sdk/Chartboost$20.class...
processing com/chartboost/sdk/Chartboost$21.class...
processing com/chartboost/sdk/Chartboost$22.class...
processing com/chartboost/sdk/Chartboost$3.class...
processing com/chartboost/sdk/Chartboost$4.class...
processing com/chartboost/sdk/Chartboost$5.class...
processing com/chartboost/sdk/Chartboost$6.class...
processing com/chartboost/sdk/Chartboost$7.class...
processing com/chartboost/sdk/Chartboost$8.class...
processing com/chartboost/sdk/Chartboost$9.class...
processing com/chartboost/sdk/Chartboost$CBFramework.class...
processing com/chartboost/sdk/Chartboost$CBMediation.class...
processing com/chartboost/sdk/ChartboostDelegate.class...
processing com/chartboost/sdk/InPlay/CBInPlay.class...
processing com/chartboost/sdk/InPlay/a.class...
processing com/chartboost/sdk/InPlay/a$1.class...
processing com/chartboost/sdk/InPlay/a$2.class...
processing com/chartboost/sdk/InPlay/a$a.class...
processing com/chartboost/sdk/InPlay/a$b.class...
processing com/chartboost/sdk/Libraries/CBLogging.class...
processing com/chartboost/sdk/Libraries/CBLogging$Level.class...
processing com/chartboost/sdk/Libraries/CBUtility.class...
processing com/chartboost/sdk/Libraries/a.class...
processing com/chartboost/sdk/Libraries/a$1.class...
processing com/chartboost/sdk/Libraries/b.class...
processing com/chartboost/sdk/Libraries/c.class...
processing com/chartboost/sdk/Libraries/c$a.class...
processing com/chartboost/sdk/Libraries/d.class...
processing com/chartboost/sdk/Libraries/d$a.class...
processing com/chartboost/sdk/Libraries/e.class...
processing com/chartboost/sdk/Libraries/f.class...
processing com/chartboost/sdk/Libraries/f$1.class...
processing com/chartboost/sdk/Libraries/f$a.class...
processing com/chartboost/sdk/Libraries/f$b.class...
processing com/chartboost/sdk/Libraries/f$c.class...
processing com/chartboost/sdk/Libraries/f$d.class...
processing com/chartboost/sdk/Libraries/f$e.class...
processing com/chartboost/sdk/Libraries/f$f.class...
processing com/chartboost/sdk/Libraries/f$g.class...
processing com/chartboost/sdk/Libraries/f$h.class...
processing com/chartboost/sdk/Libraries/f$i.class...
processing com/chartboost/sdk/Libraries/f$j.class...
processing com/chartboost/sdk/Libraries/f$k.class...
processing com/chartboost/sdk/Libraries/f$l.class...
processing com/chartboost/sdk/Libraries/f$m.class...
processing com/chartboost/sdk/Libraries/f$n.class...
processing com/chartboost/sdk/Libraries/f$o.class...
processing com/chartboost/sdk/Libraries/f$p.class...
processing com/chartboost/sdk/Libraries/f$q.class...
processing com/chartboost/sdk/Libraries/g.class...
processing com/chartboost/sdk/Libraries/g$a.class...
processing com/chartboost/sdk/Libraries/h.class...
processing com/chartboost/sdk/Libraries/i.class...
processing com/chartboost/sdk/Libraries/i$1.class...
processing com/chartboost/sdk/Libraries/i$2.class...
processing com/chartboost/sdk/Libraries/i$a.class...
processing com/chartboost/sdk/Libraries/j.class...
processing com/chartboost/sdk/Model/CBError.class...
processing com/chartboost/sdk/Model/CBError$1.class...
processing com/chartboost/sdk/Model/CBError$CBClickError.class...
processing com/chartboost/sdk/Model/CBError$CBImpressionError.class...
processing com/chartboost/sdk/Model/CBError$a.class...
processing com/chartboost/sdk/Model/a.class...
processing com/chartboost/sdk/Model/a$1.class...
processing com/chartboost/sdk/Model/a$a.class...
processing com/chartboost/sdk/Model/a$b.class...
processing com/chartboost/sdk/Model/a$c.class...
processing com/chartboost/sdk/Model/a$d.class...
processing com/chartboost/sdk/Model/a$e.class...
processing com/chartboost/sdk/Model/b.class...
processing com/chartboost/sdk/Model/c.class...
processing com/chartboost/sdk/Tracking/CBAnalytics.class...
processing com/chartboost/sdk/Tracking/CBAnalytics$CBIAPPurchaseInfo.class...
processing com/chartboost/sdk/Tracking/CBAnalytics$CBIAPType.class...
processing com/chartboost/sdk/Tracking/CBAnalytics$CBLevelType.class...
processing com/chartboost/sdk/Tracking/a.class...
processing com/chartboost/sdk/a.class...
processing com/chartboost/sdk/b.class...
processing com/chartboost/sdk/b$1.class...
processing com/chartboost/sdk/b$a.class...
processing com/chartboost/sdk/c.class...
processing com/chartboost/sdk/c$1.class...
processing com/chartboost/sdk/c$2.class...
processing com/chartboost/sdk/c$a.class...
processing com/chartboost/sdk/c$b.class...
processing com/chartboost/sdk/d.class...
processing com/chartboost/sdk/d$1.class...
processing com/chartboost/sdk/d$2.class...
processing com/chartboost/sdk/d$3.class...
processing com/chartboost/sdk/d$4.class...
processing com/chartboost/sdk/d$4$1.class...
processing com/chartboost/sdk/d$4$2.class...
processing com/chartboost/sdk/d$a.class...
processing com/chartboost/sdk/e.class...
processing com/chartboost/sdk/e$1.class...
processing com/chartboost/sdk/e$2.class...
processing com/chartboost/sdk/e$2$1.class...
processing com/chartboost/sdk/e$3.class...
processing com/chartboost/sdk/e$4.class...
processing com/chartboost/sdk/f.class...
processing com/chartboost/sdk/f$1.class...
processing com/chartboost/sdk/f$a.class...
processing com/chartboost/sdk/f$a$1.class...
processing com/chartboost/sdk/f$b.class...
processing com/chartboost/sdk/g.class...
processing com/chartboost/sdk/h.class...
processing com/chartboost/sdk/h$1.class...
processing com/chartboost/sdk/h$10.class...
processing com/chartboost/sdk/h$2.class...
processing com/chartboost/sdk/h$3.class...
processing com/chartboost/sdk/h$4.class...
processing com/chartboost/sdk/h$5.class...
processing com/chartboost/sdk/h$6.class...
processing com/chartboost/sdk/h$7.class...
processing com/chartboost/sdk/h$8.class...
processing com/chartboost/sdk/h$9.class...
processing com/chartboost/sdk/h$a.class...
processing com/chartboost/sdk/h$b.class...
processing com/chartboost/sdk/i.class...
processing com/chartboost/sdk/impl/a.class...
processing com/chartboost/sdk/impl/aa.class...
processing com/chartboost/sdk/impl/aa$1.class...
processing com/chartboost/sdk/impl/aa$2.class...
processing com/chartboost/sdk/impl/ab.class...
processing com/chartboost/sdk/impl/ac.class...
processing com/chartboost/sdk/impl/ac$a.class...
processing com/chartboost/sdk/impl/ac$b.class...
processing com/chartboost/sdk/impl/ad.class...
processing com/chartboost/sdk/impl/ae.class...
processing com/chartboost/sdk/impl/af.class...
processing com/chartboost/sdk/impl/ag.class...
processing com/chartboost/sdk/impl/ah.class...
processing com/chartboost/sdk/impl/ai.class...
processing com/chartboost/sdk/impl/ai$a.class...
processing com/chartboost/sdk/impl/ai$b.class...
processing com/chartboost/sdk/impl/aj.class...
processing com/chartboost/sdk/impl/aj$a.class...
processing com/chartboost/sdk/impl/ak.class...
processing com/chartboost/sdk/impl/ak$a.class...
processing com/chartboost/sdk/impl/ak$b.class...
processing com/chartboost/sdk/impl/ak$c.class...
processing com/chartboost/sdk/impl/al.class...
processing com/chartboost/sdk/impl/al$1.class...
processing com/chartboost/sdk/impl/al$1$1.class...
processing com/chartboost/sdk/impl/al$a.class...
processing com/chartboost/sdk/impl/am.class...
processing com/chartboost/sdk/impl/am$a.class...
processing com/chartboost/sdk/impl/am$a$1.class...
processing com/chartboost/sdk/impl/am$a$2.class...
processing com/chartboost/sdk/impl/am$a$3.class...
processing com/chartboost/sdk/impl/am$b.class...
processing com/chartboost/sdk/impl/am$c.class...
processing com/chartboost/sdk/impl/an.class...
processing com/chartboost/sdk/impl/an$1.class...
processing com/chartboost/sdk/impl/an$a.class...
processing com/chartboost/sdk/impl/ao.class...
processing com/chartboost/sdk/impl/ap.class...
processing com/chartboost/sdk/impl/aq.class...
processing com/chartboost/sdk/impl/ar.class...
processing com/chartboost/sdk/impl/ar$a.class...
processing com/chartboost/sdk/impl/as.class...
processing com/chartboost/sdk/impl/at.class...
processing com/chartboost/sdk/impl/at$1.class...
processing com/chartboost/sdk/impl/au.class...
processing com/chartboost/sdk/impl/av.class...
processing com/chartboost/sdk/impl/aw.class...
processing com/chartboost/sdk/impl/ax.class...
processing com/chartboost/sdk/impl/ay.class...
processing com/chartboost/sdk/impl/az.class...
processing com/chartboost/sdk/impl/b.class...
processing com/chartboost/sdk/impl/b$1.class...
processing com/chartboost/sdk/impl/ba.class...
processing com/chartboost/sdk/impl/bb.class...
processing com/chartboost/sdk/impl/bb$a.class...
processing com/chartboost/sdk/impl/bc.class...
processing com/chartboost/sdk/impl/bc$1.class...
processing com/chartboost/sdk/impl/bc$2.class...
processing com/chartboost/sdk/impl/bc$3.class...
processing com/chartboost/sdk/impl/bc$a.class...
processing com/chartboost/sdk/impl/bc$b.class...
processing com/chartboost/sdk/impl/bd.class...
processing com/chartboost/sdk/impl/be.class...
processing com/chartboost/sdk/impl/bf.class...
processing com/chartboost/sdk/impl/bf$1.class...
processing com/chartboost/sdk/impl/bf$2.class...
processing com/chartboost/sdk/impl/bf$a.class...
processing com/chartboost/sdk/impl/bg.class...
processing com/chartboost/sdk/impl/bg$1.class...
processing com/chartboost/sdk/impl/bg$1$1.class...
processing com/chartboost/sdk/impl/bg$2.class...
processing com/chartboost/sdk/impl/bg$a.class...
processing com/chartboost/sdk/impl/bg$b.class...
processing com/chartboost/sdk/impl/bh.class...
processing com/chartboost/sdk/impl/bi.class...
processing com/chartboost/sdk/impl/bj.class...
processing com/chartboost/sdk/impl/bk.class...
processing com/chartboost/sdk/impl/bl.class...
processing com/chartboost/sdk/impl/bm.class...
processing com/chartboost/sdk/impl/bm$a.class...
processing com/chartboost/sdk/impl/bn.class...
processing com/chartboost/sdk/impl/bo.class...
processing com/chartboost/sdk/impl/bo$1.class...
processing com/chartboost/sdk/impl/bo$2.class...
processing com/chartboost/sdk/impl/bo$a.class...
processing com/chartboost/sdk/impl/bo$b.class...
processing com/chartboost/sdk/impl/bo$c.class...
processing com/chartboost/sdk/impl/bo$c$1.class...
processing com/chartboost/sdk/impl/bp.class...
processing com/chartboost/sdk/impl/bq.class...
processing com/chartboost/sdk/impl/br.class...
processing com/chartboost/sdk/impl/bs.class...
processing com/chartboost/sdk/impl/bt.class...
processing com/chartboost/sdk/impl/c.class...
processing com/chartboost/sdk/impl/d.class...
processing com/chartboost/sdk/impl/e.class...
processing com/chartboost/sdk/impl/f.class...
processing com/chartboost/sdk/impl/g.class...
processing com/chartboost/sdk/impl/h.class...
processing com/chartboost/sdk/impl/h$1.class...
processing com/chartboost/sdk/impl/i.class...
processing com/chartboost/sdk/impl/i$1.class...
processing com/chartboost/sdk/impl/i$1$1.class...
processing com/chartboost/sdk/impl/i$2.class...
processing com/chartboost/sdk/impl/i$2$1.class...
processing com/chartboost/sdk/impl/i$3.class...
processing com/chartboost/sdk/impl/j.class...
processing com/chartboost/sdk/impl/j$1.class...
processing com/chartboost/sdk/impl/k.class...
processing com/chartboost/sdk/impl/k$a.class...
processing com/chartboost/sdk/impl/k$a$1.class...
processing com/chartboost/sdk/impl/k$a$2.class...
processing com/chartboost/sdk/impl/l.class...
processing com/chartboost/sdk/impl/l$1.class...
processing com/chartboost/sdk/impl/l$2.class...
processing com/chartboost/sdk/impl/l$a.class...
processing com/chartboost/sdk/impl/l$a$1.class...
processing com/chartboost/sdk/impl/l$a$2.class...
processing com/chartboost/sdk/impl/l$a$3.class...
processing com/chartboost/sdk/impl/l$a$4.class...
processing com/chartboost/sdk/impl/l$a$5.class...
processing com/chartboost/sdk/impl/l$b.class...
processing com/chartboost/sdk/impl/m.class...
processing com/chartboost/sdk/impl/n.class...
processing com/chartboost/sdk/impl/o.class...
processing com/chartboost/sdk/impl/o$1.class...

Same problem here.

I delete Chartboost-Unity-6.6.2 (Folder Assets\Chartboost and Assets\Plugins\Android\ChartboostSDK)
Then import with Chartboost 6.6.1 package instead.

This solve my problem. Hope this work for you all too.

I had the same problem. The problem seems to be that the classes or something inside of CBPlugin.class CBPlugin$1.class etc. have been defined somewhere else. I found out that these classes are inside the android_bridge.jar inside the ChartboostSDK\lib folder.
Deleting android_bridge.jar seemed to fix this problem. I was able to build the apk and the interstitial ads seem to play as it should.
The problem is I have not tested my solution thoroughly so I am not sure if deleting android_bridge.jar breaks something else.

P.S.1 I could not find where to download the 6.6.1 package, does anyone know if and where chartboost keeps an archive of older versions?

P.S.2 @ckrin Did you have any response from chartboost? I would like to know what they said.