When navigating to the Online Express plugin, users receive the error, "The given key was not present in the dictionary." Users can click "OK" and the error will go away, but the error will intermittently re-appear throughout the user's session within the plugin.
This is resolved with the 7/24/2018 Online Express release.
Steps to Duplicate
In the Raiser's Edge, navigate to the Online Express plugin
Error goes away
Continue to work within the plugin
Error will intermittently appear, but users can click through the error