Access to the path "/Default WebGL" is denied.

Hey folks, I’m having this problem building for any Windows or webgl build on Cloud but not locally.

[Unity] UnauthorizedAccessException: Access to the path “/Default WebGL” is denied.
[Unity] Player export failed. Reason: UnauthorizedAccessException: Access to the path “/Default WebGL” is denied.

Now, I’m using it for a student project, and so are another team, so I can see from their success that it should probably be going somewhere like /BUILD_PATH/username-projectname-buildname/ etc etc rather than just at root, but I’ve no idea what to do about it.

Any help, suggestions, or theories would be greatly appreciated!

To clarify the things I’ve already tried:
Doing ‘Clean Build’ on them.
Changing the project on the dashboard and building in another one.
Changing a bunch of settings including removing the first / from the sub-folder setting.

Oh there’s another error in the log:

/BUILD_PATH/.mason/buildpacks/unity/bin/…/libs/functions.sh: eval: line 32: syntax error: unexpected end of file

Moving the project to the root of the Git repository solved this issue. Sub-folder setting is not supported.