aapt2 apk compile error fix Commandline

while compiling some .png images i get "C:\Users\Chahal\>aapt2 compile main\res\drawable-xxxhdpi-v4\abc_switch_track_mtrl_alpha.9.png -o comp\
error: top-left corner pixel must be either opaque white or transparent." all others files sucessfully compiled only some png files got error