Fatigue module message "Stress cycle defined by stress amplitude "

Hi, I'm using the fatigue module to evaluate the results from a solid mechanics object. However, I get the following warning message: "Stress cycle defined by stress amplitude 285686239.1227691 encountered. Fatigue cannot be evaluated ". I get a Cycles to Failure plot, but an area of the object appears empty.

Any ideas on what might be producing this warning?

I mighty upload the model later if required, the computer I'm using eighty now doesn't want to load the forum page, so I'm posting from my phone.

Thanks for any help,

Alfredo