Dear Ms. & Mr Forum,
I am getting a repeatable error with the following message:

Gasman: has no handle for a bag of type [1] 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
upon request.

Regards,
Andrew Mathas