Fatal Error: Access Violation at 0X181ABD9A

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i have this problem when i do incremental compilation and i dont know why.

*** Fatal Error: Access Violation at 0X181ABD9A

Module: quartus_fit.exe

0x12BD9A : VPR_QI_FACADE::operator= + 0x12AD4A (fitter_vpr20kmain)

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please help me

bye

thanks

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Which Quartus Version and which FPGA do you use ?

What happens when you switch the incremental compilation off ?