rosversion -d returns code 255 [closed]

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For some reason I must have messed up my ros install. I have boxturtle and fuerte installed, I used rosws init and rosws set to create the directory, and I can successfully roscd to them. I source the setup.bash from there in my bashrc.

When I try and launch roscore, I get:

Invalid <param> tag: Cannot load command parameter [rosdistro]: command [rosversion -d] returned with code [255].

Param xml is <param command="rosversion -d" name="rosdistro"/>

Trying to check my ros version using $rosversion ros gives me 0.7.0 If I do $env | fgrep ROS_DISTRO I get ROS_DISTRO=fuerte

I've already tried the solution posted here (cannot run roscore due to error in rosversion)

Any help would be greatly appreciated!