Try each of the following steps in order until the issue is resolved:

1. Browse to the correct file location for the merge document:
   
   1. In Configuration, click Letters.
   2. In the left frame, highlight the appropriate type of letter.
   3. Open the letter experiencing the issue.
   4. In the File name field, click the ellipses, browse to the appropriate merge document, and click Open.
   5. Click Save and Close.
2. Change network permissions to ensure affected users have Read permission for the folder containing the letters.
3. Consult with your IT professional to have the drive repaired or brought back online.
4. Place the letters on your hard drive rather than a network drive.
5. Create the letter using Word Integration with Export instead of Classic View.