Looks like you might have had the project in a file-synced directory, and it was open on two machines at the same time, so the file-sync system renamed conflicting files. To get it back into working state, try renaming these files back to their original names:
in the Ch Data/repo.noindex folder — odb-AWR11.sqlite3 ➔ odb.sqlite3
in the Ch Data/repo.noindex/refs/heads folder — master-AWR11 ➔ master
I also recommend updating to Ch verison 4.0 and doing a Save Project As so as to update the project to the new file format which is more robust to this type of problem. You can tell you have a new version of the project when the odb.sqlite3 file is replaced with projectdata.rope