This error is the same as before. The line of code being referenced isn't in the code anymore so something is up and you don't have the latest version. Try installing the upgrade package from snowcovered again. The filename is HilbertSolutions.ConstantContactSignUp_01.02.10_InstallDNN5xAndAbove.zip.
If that doesn't fix the problem you should go to the host settings and clear the cache and see if that helps.
I retested the fix and it works for me.
If all else fails I would say that you should completely remove the module and then install the new version.
I am more than happy to take a look at your site if you provide me with a host account. You can send it to Stuart at hilbertsolutions dot com
Stuart