[Ipopt] Cutting back alpha due to evaluation error

[Martin Schmidt]

Hi,

I have an NLP for which I often get the message

	"Warning: Cutting back alpha due to evaluation error".

I know that this has something to do with constraints that are not well 
defined at the current point (like sqrt of negative numbers etc.).

Is there any chance to analyze at which constraint in the model the 
problems occurs? I thought I could find some "inf" or "nan" values in 
the higher output levels but I didn't find anything.

Thanks in advance,
Martin