This issue occurs if the record in The Raiser's Edge has been deleted or merged with another constituent record in the RE database before the Volunteer Request is processed

For example: 
1. User submits the volunteer opportunity form in NetCommunity
2. The request comes across to the plugin but is not immediately processed.
3. During that time - database cleanups are performed and some records are merged/deleted breaking the link with the original submission and constituent record in The Raiser's Edge
4. When viewing the transaction in the plugin those records now show "There was an error loading the constitue..."