Dear Ms. & Mr Forum,
I am getting a repeatable error with the following message:
Gasman: has no handle for a bag of type  and size 20.
What I would like to know is if any one recognises this error and knows of a
probable cause. I suspect that the problem is with my own code as I am
dealing with recursively nested lists at this point in the calculation, but
smaller examples work fine so I am confused by the error. If anyone has any
thoughts then I would be pleased to hear them.
Apologies for the complete lack of information as to what causes this
error. I have not isolated it to a small enough piece of code to inflict
upon innocent readers without a guilty conscience. I can provide details