Amber calculations



 Hi Netters,
     I am facing some problems using Hyperchem, version 3 and 4, Hypercube
 Inc. for doing Amber calculations on a glucose molecule. Each time I
 attempt the calculation,  warning message appears ststing that
  No bending parameters found for atom types OS-CT-OS.
  Essentially, the bending parametrs are missing for the O-C-O linkage.
 Could anybody throw some light on this problem? On a similar vein, I have
 problems with an indole molecule in which the bending parameters missing
 are of the type CA-CN-NB.Could anybody help me?
  Thanks in advance,
  Michel