Error when trying to add VectorDrawable -

after trying add vectordrawable, there mistake, regained when there new , please tell me problem ?

error:(10, 40) error: cannot find symbol class r error:(67, 34) error: package r not exist error:(11, 40) error: cannot find symbol class r error:(68, 34) error: package r not exist error:(11, 40) error: cannot find symbol class r error:(68, 34) error: package r not exist error:(11, 40) error: cannot find symbol class r error:(68, 34) error: package r not exist error:(11, 40) error: cannot find symbol class r error:(68, 34) error: package r not exist error:execution failed task ':app:compiledebugjavawithjavac'. > compilation failed; see compiler error output details. 

this looks r issue , when r answer "package r not exist", should read command you've run , see if 1 of function not refer package needs installed... it's mispelling stuff.