command [git diff] exited with code 128. message: fatal: ambiguous argument 'get-diff-action/master...get-diff-action/pull/18/merge': unknown revision or path not in the working tree. Use '--' to separate paths from revisions, like this: 'git <command> [<revision>...] -- [<file>...]'

>> fatal: ambiguous argument 'get-diff-action/master...get-diff-action/pull/18/merge': unknown revision or path not in the working tree.

>> Use '--' to separate paths from revisions, like this: