unable to calculate the Force field Type for particle 'ZN1'
The typing engine has been unable to assign a forcefield type.
No typing rules found that match (except the wildcard '?').

The typing engine has failed to calculate a forcefield type for 1 particle.
Try using a different forcefield or assign types manually (and remember to turn off the automatic calculation of forcefield types).
Unable to calculate energy and gradients.    
Geometry optimization finished with an error condition.

This error occurs in Material Studio during the geometry optimization of zinc metal and Zn(110) surface using the COMPASS force field. A solution is sought that does not involve changing the applied force field.

Thank you for your help. I have typed my model manually (Modules | Forcite | Calculation | Energy | More => turn off 'Calculate automatically' => click 'Calculate'), the first image appears and the atom that cannot be typed is highlighted in the second image, what can I do? (I'm using COMPASS force field, not COMPASSIII and pure Zn metal)