Problem with integration with Tiny File Manager

I have the current code from https://github.com/prasathmani/tinyfilemanager

The previous version worked for me in this way: I pasted everything from the tinyfilemanager.php file into the view that was called by the controller and everything worked properly.
Now after changing to CodeIgniter 4, unfortunately it doesn't work and the error I get is given above
I will add that adding information from https://tinyfilemanager.github.io/docs/#Embedding to the controller unfortunately has no effect