Crystal report parameter calendar creating script error.
FWIW, we had a client getting a script error in a customized report when they respond to a date parameter prompt with the Calendar button. Manual entry of a date worked fine. We tried replacing .net on the workstation and a couple other things that did not work.
The fix (from an SAP blog) was to backup and then replace the 'prompting' folder with one from another workstation. The folder lives in C:\Program Files\Business Objects\common\3.5\crystalreportviewers115\prompting .