fail to execute command in astro when doing CTS

[eecarefree]

When doing CTS the following error happend in the gate level optimization step
After the astro successfully completed the clock tree synthesis and doing the build-in optimization, the following message appears in the log file

starting gate level 2 optimization
*****************************************
*Overlap removal(OV) engine terminated
*****************************************
fail to execute command


and the design flow terminated with nothing can do next

Could anyone please help fix this problem? Thank

 

[Jeffrey1905]

Is there any warning or error message prior to termination?

 

[eecarefree]

no warings and errors, and have one capacitance violation. But I think this is not the reason, since I have reconstraint the capacitance and the same error happend again.