Dear Sir, I am trying to do the addaccu tutorial. I follow the procedure state in tutorial.ps and I find there is problem when I run the following command. "genlib -v addaccu" the screen shows: *** mbk error *** can't open file : pvsse_sp.vbe And I notices the cell lib is: $TOP/cells/scr:$TOP/cells/ring but I cannot find these directory under the directory of cells. Would you please help me to solve this problem? Best Regards, Ray Cheung Student from The Chinese University of HK