It is not an error; it is rather an warning saying you must perform an elastic analysis for your case.
Having no API 650 guidance to understand the way to develop such calculation, no software considered it.

It is API 650 which stipulates in 5.5.3 that "Beyond this height [i.e. the effective product height of H × G ≤ 23 m (75 ft)] an elastic analysis must be made to determine the annular plate thickness.".