Condensation Analysis - Error 53

HI,

I am running a simulation on Bentley Hevacomp V8i.

I have created the roof on the Fabric Data Tab. I then click on the MAT Tab. Here i select new project, exposed roof ect. Then under the roof data tab, when I try to add a layer (where i can specify thermal properties of each layer) i am given a "run-time Error '53'" and the porgram closes. 

Am I taking the right steps etc.?
Do you have a tutorial available?

Please respond with urgency.

Thanks and Kind Regards
Jack

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