This error message may appear with different variables (file path, name, specific error) but is usually an indication that the disk storage limit for your account has been reached. You may check your disk usage by logging into your control panel
FrontPage requires a minimum of 5MB of free space to create a temporary file during publishing, updating or recalculating a web on the remote server. If the disk limit is reached before those processes are completed, FP will return an error. In order to correct this error and allow FrontPage to have sufficient space without corrupting your extensions, you can delete some files, upgrade your account or purchase additional disk space.
More information can be found on this at Microsoft.com