android studio 导入新版的demo 运行时出错

android studio 导入新版的demo 运行时出错
:easeUIDemo:transformClassesWithInstantRunVerifierForDebug
:easeUIDemo:transformClassesWithInstantRunForDebug
IncrementalSupportVisitor Visiting com/easemob/chatuidemo/BuildConfig
IncrementalSupportVisitor Visiting com/easemob/chatuidemo/Constant
IncrementalSupportVisitor Visiting com/easemob/chatuidemo/DemoApplication
IncrementalSupportVisitor Visiting com/easemob/chatuidemo/DemoHelper$1
IncrementalSupportVisitor Visiting com/easemob/chatuidemo/DemoHelper$10
:easeUIDemo:transformClassesWithInstantRunForDebug FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':easeUIDemo:transformClassesWithInstantRunForDebug'.
> java.lang.ClassNotFoundException: com.easemob.exceptions.EaseMobException

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 6.665 secs