You surpassed the 65k method limit in DEX.
Earlier versions of Android build system report the error as follows:
Conversion to Dalvik format failed:
Unable to execute dex: method ID not in [0, 0xffff]: 65536
You can read about the problem and an official workaround here: http://developer.android.com/tools/building/multidex.html
Google Play Services is a major reason you are reaching this limit. If you switch to the gradle build system you can specify which APIs to compile into your executable. See: https://developers.google.com/android/guides/setup