Hello fellow Leeds student,
I know this is probably too late for you, but it might be helpful for someone else:
Look at the error log for the proposed design files, this will list the errors in the input data that means that SBEM can't run it. For each error, go back to your input data, find the relevant input, and make sure it is input correctly.
However, there is a bug here. With some of the input values, Ecotect adds in quotation marks. This breaks the process since SBEM reads "Not related to the owner" differently to Not related to the owner. There seems to be no way of stopping Ecotect adding in these quotation marks, and as a result, I'm unable to do my Part L calculation!