Plugin doesn't work

We just installed the Constant Contact nopcommerce plugin and the key and access token seem to be correct. When we check the boxes to export registered customers our lists from Constant Contact are in the drop down for selection. The issue is if we attempt a manual sync or a clear queue a error comes up "failed to manual sync queue" or "failed to clear queue". Also if we attempt to test by adding an email to upload it also fails.

I changed documentation.
http://www.foxnetsoft.com/documentation-constantcontact
Please read it again.
You should use Key and AccessToken (not secret). Please create AccessTokenand try. Write me about result.