when I use quartus II 15.0 ,there is an error that is :Internal Error: Sub-system: VPR20KMAIN, File: /quartus/fitter/vpr20k/quartus_interface/qi_common/vpr_qi_tdc_util.cpp, Line: 1120. please help me ,thank you!

Hi,

I could not find any related cases in our database. The only method is to upgrade the design to the latest version and see if the problem persists. If yes, kindly provide the sample test case in the latest version for investigation.

Thanks.