I fixed the problem with the following steps. Remember to replace username with your username.
1. Open a terminal window and issue the command, sudo chmod 644 /home/username/.dmrc to change the permissions of the .dmrc file.
2. Type sudo chown username /home/username/.dmrc and hit enter to change the owner of the file to you.
3. Entering sudo chmod 700 /home/username
Problem solved. :-)