Need Help on adding WADs on SRB2

[Mark2345]

when i try adding WADs on the game it says it could not load
and i put this:
addfile supersonic.wad

 

[Chaos Knux]

1) No colors please, they hurt on some layouts.
2) Is it in the same folder as srb2win.exe?
3) What was the error message?

 

[Max the hedgehog]

when i try adding WADs on the game it says it could not load
and i put this:
addfile supersonic.wad

could not load or could not find?