Android project build is failing

Questions & Answers
1

I’m trying to make an android project after it has become free, but I keep getting this error whenever try and build it, any help?

Error building Player: Exception: android (invokation failed)
ERROR: unknown error
cmd:android list target -c
stdout;
stderr:
Exception in thread "main" java.lang.NullPointerException
	at SDKMain.main(SDKMain.java:62)
2

You need to downgrade the Android SDK, theres a thread about the same issue here