Thank you for your post.
Close all files on FileMaker Server 10 and quit. Put a copy of FileMaker Pro 10 on the server and open the database file.
For now, don't use the script. Instead, pull down the File menu and select "Import -> XML Data Source..." and enter the path and filenames directly. If this works, then try using the the path as a calculation using Get (DocumentsPath). If this works, then try the script. Somewhere, the process is breaking down, so you will need to do a little sleuthing. Once you get it working, then quit FileMaker Pro, start FileMaker Server and open the file. Then, try again from the client side.
Please continue to update the forum with your progress.
We are running 10.7.3 and FM Server 184.108.40.2064 and have a script running every 5 mins importing with a stylesheet. At random times the 718 error is occurring and of course there is nothing in the logs that elaborates on what the error is.
If I run the process on Filemaker Pro 11 client using the same script and XSLT the error is not reproduced.
To correct this stopping and restarting the service works, however this means kicking off all users at the time and isnt a proper workaround.
More detailed error reporting is required here please !!!