This error occurs when the game is trying to do a file operation (e.g. saving a game state) and the current system user doesn’t have access.
This is most likely related to the anti virus software on your system.
Try to set it into gaming mode or add imagine earth to the white list.
If this doesn’t work it often helps to completely (!) uninstall the anti virus software and then reinstall it.
If it still doesn’t work please get in contact with us or have a look for other programs that might access the game’s savegames.
Posted in: 2. Errors