Getting errors when trying to use the online material library add on

The title pretty much says it all

You can download this one file that was changed and use it to replace the addons_contrib/online_mat_lib/__init__.py that you have now. Another option is to download my entire contrib repo (about 20MB) which also has other addons included and copy the online_mat_lib folder (or all of it) into the addons_contrib folder.