Rated 3 out of 5 stars

I use TB24.3.0 , lighting2.6.4 and StormCows0.3 version. I get MODIFICATION_FAILED error message when I try to create a todo, but modify a todo content is no problem.

This review is for a previous version of the add-on (0.3). 

This is likely because the list associated with your calendar is a Smart List. This is something I'd like to fix in the future, but for now it's logged as an issue:

https://github.com/moldybeats/stormcows/issues/3