Error message: Allowable Stress analysis only. (I)

 I am modeling a steel floor beam in LARS using LFD and I am recieving this error message: AASHTO 10.34.4.4 M/V interaction fb calculated exceeds calculated bending stress.  Allowable Stress analysis only.  (I) 

Obviously it is referring to AASHTO but what does the "Allowable Stress only" part mean?  Does it only analyze ASD or is ASD not analyzed but LFD is?