This file cannot be deleted because this is an offline remote file that has not been downloaded.
To delete the file, you must move the project back online.
Explanation
You have requested to delete a placeholder file in
an offline project. A placeholder file represents a remote file that
has not been downloaded and does not exist in the local workspace.
This message usually results from an API operation rather than a user-interface
operation.
User response
Move the project to online state and try the operation
again.