Print Merge

Hello guys i am new to this forum
i have problem to solve 

some one need 8" x 6" 150 labels, label start as 001 - 150, he wants to print it on flex, our flex size is 48" wide
i already create print merge on 150 documents when i use imposition layout to print it as PDF its getting internal error VG core error?

why was that 
can any one help me
THank you