Designer learning Statamic locally with a trial copy. All's going well until I suddenly get an error on my page with a mounted collection:

Exception in CollectionTags.php line 138:
Collection [cast_2017] doesn't exist.

In addition I cannot log into the CP and get:

These credentials are incorrect

I was able to go back to an earlier commit and salvage my work up to that point. But then it happened a second time so I'm getting concerned.

Any ideas what I'm looking at here? Thanks.