steam version and disc version not working with each other

[steam version and disc version not working with each other]

thanks for the speedy reply but in the multiplayer menu when I had clicked on his server that is what it said but I will still try and check versions

[steam version and disc version not working with each other]

hi me and my friend tried to play a private game today but when he tried to join mine it said connection lost. then he tried hosting and I tried joining but it said the same thing. I then noticed that the versions were both 1.59 but one of them was red. I have the steam version and he has the disc version. I was jsut wondering if there is anyway around this problem so we can still play together.