STAAD PRO ERROR

Hey,

I am having the following error and I can't figure out how to fix it. 

*** ERROR : PROBLEM FACED IN READING LREFFILE - INTERNAL ERROR.

*** ERROR IN INPUT DATA FOR REFERENCE LOAD CASE 0 . ***

Please let me know if you see anything wrong with my model.

Thanks, 

Ian

Centrifuge Sumps REV A.STD