Dear all,

Im having difficulty getting the interation energy of a polymer and Al2O3. I'm follwing the tutural (Polymer interactions with a metal oxide surface) and built up the layer. Nonethless, towards the nede of tutorial for the geometry optimization of the polymer layer I'm getting the error: 

Unable to calculate the ForcefieldType for particle 'AL'
The typing engine has been unable to assign a forcefield type.
No typing rules found that match (except the wildcard '?').

Could you please assist me with this. Also I woudl appreciate it if you could comment on the system setup as a huge fraction of polymer stays out of the layer. Does this lead to in accuracy when computing biding energy?

Thanking you in advance,

Serene