problem) there's a problem with MIME::Base64. Version 3.07 of Base64.pm is being found, but the version of Base64.so is 3.05 (which would typically indicate a botched attempt at installing MIME::Base64).
You need to have the same version numbers of Base64.pm and Base64.so. A proper and successful re-installation of MIME::Base64 will take care of that.