This error was to do with the flaming torches; the fire effect attribute in the animation had somehow been deleted at some point in the devlopment and this effected not just one the fire animations but all of them. This meant that I had to go back over the entire scene and redo them all one by one.
Also I have been able to start the next section of the animation despite the setback, which is the Hell world itself. I have finished the intial scene with fire, applied materials and the editing of the terrrain itself. I also created a door ant the start of the staircase to represent the door that was entered in the first scene. The images below display these items.
Stage 19

Stage 20

Stage 21



