Dear WeatherCat AppleScript fans,
This advice is old but needs to be repeated. Try to never have more than one copy of the same AppleScript application. Actually the advise is universal, it isn't even a good idea to have say two different versions of WeatherCat application on your hard drive. The problem is that the Finder can confuse the versions and launch one that isn't current. AppleScript's requesting data often cause the wrong application to be launched.
This can be a problem for those of us involved in beta testing (of WeatherCat or anything else.) To avoid the problem, compress any archival copies you want to keep around. If you need to compare two things like an old and newer AppleScript don't keep both around for long. Once you've made your comparison, place the unwanted copy in the trash and
empty the trash! If you don't empty the trash, the Finder can still insist upon trying to launch the version in the trash and generate an error instead of your desired result.
Hopefully some prudent advice that will nip problems before they get started!
Cheers, Edouard