FEKO producing empty .pre files, unable to run simulation

Hello,

I am attempting to build and run a model with focus on studying cable currents in HIRF and ESD situations, however i seem to continually be running into problems where the .pre file is empty. It does not repopulate with creating new geometries or other changes to the model and attempting to run the model gives the error "No EG card (end of geometry) was found in the *.pre file".

I am unsure if it an error I am making or something more fundamental.

Thanks!