Execution Failed For Transformclasseswithjarmergingfordebug'. (volley)

I am trying to build my app on android studio virtual simulator, I have successfully tested on api level 21 and above now I am testing lower level api 19, but whenever I run i will

Solution 1:

You are using 2 different versions of volley libraries

compile'com.android.volley:volley:1.0.0'compile'com.mcxiaoke.volley:library:1.0.19'

use any one of the above

and I dont know about

compile'dev.dworks.libs:volleyplus:0.1.4'

If that is similar library to above two ,the error will still remain