What do you if no dennen mansfield?

Please clarify your question. I'm not sure what you're asking.

Do you mean:

* What do I do if there are no dennen mansfields? (Assuming "dennen mansfield" is a specific thing or concept)

* What do I do if I cannot find information about dennen mansfield?

* What do I do if I have a problem with a dennen mansfield?

Once you clarify, I can provide a more relevant response.