AS編譯報錯More than one file was found with OS independent path 'classes.jar'

build項目時報錯
More than one file was found with OS independent path 'classes.jar'
開始三板斧
build->clean project
build->rebuild project
file->invalidate caches/restart
清空.androidstudio4.0/system/caches
以前都會自己好，這次怎麼都無效，最後google找到這個issues
把gradle從3.5.2長級到3.6.4，錯誤消失。