Currently, there is not a way past this error, other than to close and reload your Forms Manager from within Blackbaud Grantmaking as the error is intermittent.
Our Developers are addressing this issue at high priority and we hope to have more details to share with our clients soon - we will keep this article updated with any relevant information.
In the meantime, please open a case with Blackbaud Grantmaking Support so that we may track your issue and keep you posted.
UPDATE 7/17/2018: This should now be resolved. If the behavior persists, please reach out to Support so that we may investigate further.