This message is usually related to having some zones off for processing when design changes means the the information for those zones is no longer current and the temporary zone file is out of sync with the design.
Turn on all zones for processing, run Analysis, and then turn off the zones you want off.
If this does not help, then it could be related to the temporary files being read-only in the TEMP folder.
This might be because there is an existing file that is "Read-only" and therefore can't be accessed. In this case you should empty the TEMP folder and try again.
In general, you will need to browse to C:\Users\[your login name]\AppData\Local\Temp\ and delete all the files in the Temp folder (which is a good thing to do periodically anyway).
To empty your Temp folder:-
1. Browse to C:\Users\(Your login name)\AppData\Local\Temp. Note that if you can't see the "AppData"folder follow the forum post https://www.irricad.com/phpbb3/viewtopi ... 1423#p1423 to enable hidden folders.
2. Select all the contents and press the Delete button on the keyboard. Note that any programs that are currently running won’t allow their in-use temporary files to be deleted, which is fine in this case. Simply select "Skip" and enable "Do this for all current items".
If the issue persists please let us know.
The IRRICAD Team