A whole folder has been deleted from your Animations folder called 'overlay'.
Simple way around this is to unpack .capx to a new folder using 7-zip or something similar. This will extract the project structure.
Go into the Animations folder and copy and paste any folder. Rename copied folder to 'overlay'.
Dbl-click on 'New project.caproj' to launch. It should now load and allow you to fix whatever went wrong.