Dear all

I have been building a model with a large number of shells. I understand
that this is not ideal but I have many overhangs and setbacks.

Once I reach about 60-70 shells a get the following error messages:

"ShellWiz has no valid ZnGrpWiz children."

"Error: No ShellWiz components exist."

"Error creating BDL input file from wizard inputs!"

After these messages the model becomes unusable. Is this likely to be a
shell problem or perhaps something to do with the limitations of running
in wizard mode?

Any suggestions much appreciated.

Regards

Richard