rewriter: fix error message
@@ -501,7 +501,7 @@ class Rewriter:
arg_node = None
if cmd['function'] == 'project':
if cmd['id'] != '/':
- mlog.error('The ID for the function type project must be an empty string', *self.on_error())
+ mlog.error('The ID for the function type project must be "/"', *self.on_error())
self.handle_error()
node = self.interpreter.project_node
arg_node = node.args
