Problem with F3 and F4 menu DarkRP gmod 13

Hi, I have a problem with my darkRP in gmod 13, F3 and F4 menu does not work, when I try to Open it nothing appears on the screen, look at the console and saw the following error:

http://subefotos.com/ver/?f42d2b7bc3c429d7259431ea3619e124o.jpg