Build error with no error msg

[peerless2012]

14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] 
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] FAILURE: Build failed with an exception.
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] 
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] * What went wrong:
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] Execution failed for task ':app:transformClassesWithTraceManTransformForStagingDebug'.
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] > java.lang.NullPointerException (no error message)
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] 
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] * Try:
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] Run with --stacktrace option to get the stack trace.  Run with --scan to get full insights.
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] 
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] * Get more help at https://help.gradle.org
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildResultLogger] 
14:28:01.816 [ERROR] [org.gradle.internal.buildevents.BuildResultLogger] BUILD FAILED in 43s

[luckybilly]

应该是traceconfig.txt文件没找到，请确认一下文件路径是否正确（作者在issue #14 中回答了这个问题）