Contact Using Optistruct

I am using HM 17.2 (Optistruct) and have no Radioss.

My problem is using Contact in Optistruct. Somehow I can't get the result I am expecting because of the problems I have in my model.

The contact doesn't seem to function the way I want it to be.

There are errors that I don't get. Some errors are:

 *** INFORMATION # 4739
 The structure of surface-to-surface contact element is quite different than
 that of node-to-surface contact element. No internal CGAP/CGAPG elements are
 created for surface-to-surface contact.

 *** INFORMATION # 3433
 MUMPS solver is used by default for nonlinear analysis at subcase 1.

I have only 1 version of HM and have only Optistruct too.

Educate me please /emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

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