How to get the shape shoulder function to work?

I was analyzing my data on chromeleon 7 and was using the shape shoulder function for the first time. It worked initially but when I changed the baseline it stopped working, and I made too many changes overall to go back to it. I'm getting the error message "Can't create a valid exponential rider baseline at this point". Does anybody know how to fix this or another way to set shoulders on a chromatogram?