This error occurs when the Blender DTS exporter is unable to open the dts file in the specified location for writing. This has several possible causes:
- Insufficient file system permissions for the user account under which Blender is running to write to the current export file/folder.
- A previous crash of the exporter caused the DTS file to become "locked" (the OS thinks the file is still being written to)
- Another program or process has locked the target dts file for writing
- Possible invalid output file name or folder/directory
Troubleshooting:
- Close the exporter, save your .blend file, and restart Blender to see if the file lock is cleared.
- Close any other processes that might be using the file
- If restarting Blender fails, try rebooting your computer
- Check in the exporter's general panel to make sure that the output folder and file name are valid.
- Check your operating system user permissions to ensure that your user account has write permissions for the file/folder/directory that the exporter is attempting to write to.