In order to resolve the above error received by your External Reviewer, you must make sure they only have one contact record within GIFTS which has their e-mail address, and has the Reviewer Portal Access checkbox checked. 

To correct the error please do one of the following:

1. Log in to GIFTS
2. Select contacts when performing a quick search
3. Enter the contact's full name in the search box
4. If you receive multiple contacts of the same name and same e-mail address, please consider consolidating or deleting one of the entries

OR

1. Log in to GIFTS
2. Click Full Search
3. Select Contacts on the left
4. Click 'Add Filters'
5. Check E-mail Address > Done
6. Enter the email address of your external reviewer > Search
7. If you receive more than one result matching the e-mail address entered, please consider consolidating or deleting one of the entries