cadence problem : IP3 and IM3 with PWL

 Hello All/Cadence Support,
           I am having the problem figuring out how to run  IM3 and IP3 simulation if the input file is a pwl file. I am easily able to run all other analysis of PSS except the IP3. I have tried PSS+PAC, QPSS which are usual for calculating IP3 but it dont work. For example,with the PSS+PAC analysis the PAC>IPN Curves has the message ''The data for each sideband of the pac analysis contains are frequency sweep.As a result,the above selected function cannot be executed'.
I need urgent help in this regard!