If you've been getting the error above and downloaded Connector net but it still throws the same error it's because it isn't the right version. They released 6.6.4 a few days ago this throwing people off and installing the wrong one.
. If you want the proper one you can find 6.5.4 at the link below. Just wanted to point this out for people providing support for this issue and people having the issue themselves. I've posted this previously in the release thread for 3.9.1 but just wanted to make it seen more.
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Thanks and I hope this helps.
All credits goes to Tristan from 0taku.