This message means Corona was unable to save temporary distributed rendering scene file on the master machine. Default scene saving location is:
C:\Users\[username]\AppData\Local\Autodesk\3dsMax\2016 - 64bit\ENU\en-US\plugcfg\corona
An internal error occurred when attempting to save temporary DR scene file.
- Make sure you have enough free hard drive space
- In case you have enough hard drive space, please report this problem at: https://corona-renderer.com/forum/ or submit a new support ticket