Unable to parse YAML file

Questions & Answers
1

Whenever I open a project I get 4 error messages saying
Unable to parse YAML file: [mapping values are not allowed in this context] at line 1

This is not caused by any .scene or .meta files, this error appears in a brand new blank project too.

Looking at the editor log I think the error is occurring even before Unity opens the project.

I’ve tried uninstalling Unity and deleting any folders named unity from appdata but I’m pretty sure my settings are somehow still being saved somewhere.

2

Deleting the unity files from the registry caused the errors to go away, my guess is that some of the files got corrupted somehow.

3

I’m getting the same problem with a newly created project. Unity 2017.4.0f1.