Too many classes in -main-dex-list

Question

I get this exception when creating my application.

UNEXPECTED TOP-LEVEL EXCEPTION: com.android.dex.DexException: Too many classes in --main-dex-list, main dex capacity exceeded at com.android.dx.command.dexer.Main.processAllFiles(Main.java:494) at com.android.dx.command.dexer.Main.runMultiDex(Main.java:332) at com.android.dx.command.dexer.Main.run(Main.java:243) at com.android.dx.command.dexer.Main.main(Main.java:214) at com.android.dx.command.Main.main(Main.java:106) 

I searched everything and found a workaround:

http://blog.osom.info/2014/12/too-many-methods-in-main-dex.html

But what is the proper solution to this problem?