Probleme with rolling procces simulation on ANSYS workbench

part of my bachelor projects requires analysis of the rolling proccess on ansys but when i do it either the billet passes through the the two rolls without deformation, or when i change contact to friction with a co efficient of 0.2 my analysis doesnot work and it shows the following messages

1-Not enough constraints appear to be applied to prevent rigid body motion. This may lead to solution warnings or errors. Check results carefully.

2 Large deformation effects are active which may have invalidated some of your applied supports such as displacement, cylindrical, frictionless, or compression only. Refer to Troubleshooting in the Help System for more details.

3 Contact status has experienced an abrupt change. Check results carefully for possible contact separation.

4 The solver engine was unable to converge on a solution for the nonlinear problem as constrained. Please see the Troubleshooting section of the Help System for more information.

5 The unconverged solution (identified as Substep 999999) is output for analysis debug purposes. Results at this time should not be used for any other purpose.

thanks in advance i would really appreciate if someone could answer me