求助大神，复合物参数文件缺少二面角参数

离去无期

在建立复合物prmtop 文件和inpcrd文件时，出现了一下问题，不知如何解决C:\Users\wangyan\Desktop\1?
> saveamberparm a com.prmtop com.inpcrd
Checking Unit.
Building topology.
Building atom parameters.
Building bond parameters.
Building angle parameters.
Building proper torsion parameters.
** No torsion terms for  ca-ca-ce-c2
** No torsion terms for  ca-ca-ce-ha
** No torsion terms for  ca-ca-ce-c2
** No torsion terms for  ca-ca-ce-ha
Building improper torsion parameters.

total 1042 improper torsions applied
Building H-Bond parameters.
Incorporating Non-Bonded adjustments.
Parameter file was not saved.