Check the following system parameter is already in System Parameter Maintenance:
Key: WebServices
Code: FileURLLocation
Value: C:\OpenEdge12\WRKx64\Proclaim\webapps\fileview-2.0\temp|
Alternatively, the value field may have spaces or character returns. Use the keyboard left and right cursor keys to check.
If you're still having any issues with the above, please raise a new case online and reference the title of this article.