Execution failed for task ':app:mergeDebugResources'

Execution failed for task ':app:mergeDebugResources'.

java.util.concurrent.ExecutionException: com.android.builder.internal.aapt.v2.Aapt2Exception: Android resource compilation failed

注意看代码提示
attr/actionBarSize 查看该module下或者依赖actionBarSize是否定义，如果定义了，尝试clean or rebuild

感觉是你更新buiid.gradle导致的，版本不一致