When posting check payments at the Action Board I receive the error: "The specified path for the output file does not exist"

The presence of special characters in the Checkbook ID name is known to generate this warning with use of the Action Board.
 
Review the Checkbook ID and note if there are special characters in the name,  for example, "A/P OPERATION"
 
You can rename the checkbook using the PSTL tool in GP.
 
1. Start the PSTL function in Dynamics GP.
2. Select the Checkbook Modifier option.
3, Click Next.
4. Select the Old Checkbook ID.
5. Select the New Checkbook ID.
6. Click the Convert button.
7. It will prompt you for a backup – make a backup and select Continue.
8. Click OK.
 
Note:  Prior to renaming the Checkbook ID, ensure there would be no impact on any other third-party software or existing unposted batches in GP