Witango-Talk: how many instances does it take

[Roland Dumas]

I have created an instance of a tcf object, then called a method from it.
so far, so good.

I call another method from the same class and get:

The specified object's handler doesn't support method invocation.
tax_shipping

File: store.taf
Position: tax_and_ship2
Class: Internal
Main Error Number: -2


The specified object was not found.
tax_shipping

If I create another instance, the method works, but I thought you only had to create a single instance of the class, whereupon you could call methods from it at least for that request cycle.

what might I be doing wrong?