android - Content is Not Allowed in Prolog in res images -

i have read others answers cant figure out...please me. when tired copy splash screen images res folder...after copying files getting errors

home/nteam/orderliteproject/orderlite/app/src/main/res/xxxhdpi/sp_bg.png error:(1, 1) error: content not allowed in prolog. /home/nteam/orderliteproject/orderlite/app/src/main/res/hdpi/sp_bg.png error:(1, 1) error: content not allowed in prolog. /home/nteam/orderliteproject/orderlite/app/src/main/res/xxhdpi/sp_bg.png error:(1, 1) error: content not allowed in prolog. /home/nteam/orderliteproject/orderlite/app/src/main/res/mdpi/sp_bg.png error:(1, 1) error: content not allowed in prolog. /home/nteam/orderliteproject/orderlite/app/src/main/res/ldpi/sp_bg.png error:(1, 1) error: content not allowed in prolog. /home/nteam/orderliteproject/orderlite/app/src/main/res/xhdpi/sp_bg.png error:(1, 1) error: content not allowed in prolog. :app:mergedebugresources failed 

i tried delete these images , try recompile steel same error. please me.

you have invalid directory names in /res. valid directory names drawable resources start drawable-. example, drawable-xxxhdpi, drawable-xxhdpi, drawable-xhdpi, etc.