After importing facebook sdk, proj wont compile anymore

Questions & Answers
1

I want to implement facebook social but I can’t get pass through this error:

First error:
Error:Invalid command dx

UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()

Second Error:

Error building Player: CommandInvokationFailure: Unable to convert classes into dex format. See the Console for details.
C:\Program Files (x86)\Java\jdk1.8.0_05\bin\java.exe -Xmx1024M -Dcom.android.sdkmanager.toolsdir=“C:/Users/Yeung/Desktop/adt-bundle-windows-x86-20140321/sdk ools” -Dfile.encoding=UTF8 -jar “C:/Program Files (x86)/Unity/Editor/Data/BuildTargetTools/AndroidPlayer\sdktools.jar” -

What to do?

2

fix it.
opened the sdk manager and downloaded android sdk build tools 19.1.
after the download, went to sdk->build-tools->19.1, copied the zipalign.exe and pasted it to sdk->tools