I built a cristal structure by  combining two periodic boxes by using Build Layers.  When I start the  dynamic simulation in Forcite, the program gives an error:

96 inversion(s) have been deleted from the energy expression as they have no forcefield parameters.

---- Thermostat ----

Nose mass parameter, Q mass: 2768.35 kcal/mol*ps^2

Dynamics calculation - Aborting dynamics.

An unphysical integration step (>100 Angstroms) has been detected.

Try reducing the time step or relaxing the structure first.

How can I solve this problem?