[Wien] "stop core end" Kindly help .Not able to find optical property

[Masood Yousaf]

I am working on a oxide for which when I run the scf cycle with MBJ the cycle runs like this

Lapw0
lapw1
lapw2
stop core end

why is this "stop cor end " appear. all the cycles are executed successfuly . But when I try to find the optical real and imaginary part graph . It says file is empty 
 Kindly guide me how to correct this problem
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