Sublime Text v3 Plugin Load Problem

[mywebmanavgat]

reloading plugin RainbowBrackets.main
Traceback (most recent call last):
File "C:\Program Files\Sublime Text 3\sublime_plugin.py", line 125, in reload_plugin
m = importlib.import_module(modulename)
File "./python3.3/importlib/init.py", line 90, in import_module
File "", line 1584, in _gcd_import
File "", line 1565, in _find_and_load
File "", line 1532, in _find_and_load_unlocked
File "C:\Program Files\Sublime Text 3\sublime_plugin.py", line 1199, in load_module
exec(compile(source, source_path, 'exec'), mod.dict)
File "C:\Users\Mehmet\AppData\Roaming\Sublime Text 3\Installed Packages\RainbowBrackets.sublime-package\main.py", line 199
f"loaded file: {(self.view.file_name() or 'untitled')}",
^
SyntaxError: invalid syntax