Help with testing!!!

[DJCee]

I have downloaded jDoom so that I can edit it using Doom Builder. I select the .wad file and it displays the first map, but then it comes up with a box containing errors about various 'lumps'. Also when I go to test the level it says 'No engine selected'

Please help me out here!!! What exactly am I supposed to do?

[RandomMarine]

Figure it out from there.