>Hello Ray,
>
>>I believe you get that error when you add a node and the key you use is already in the treeview ( not unique ).
>It happens only on particular comps, so, I think that it isn't the cause of
>problem. Anyway, thatnks for the thoughts.

I just spent a couple of hours trying to understand TreeView, and found that I'll get the number when the index can be interpreted as a number. I had to force a non-numeric "_" character into every key (yes, I finally have it all working). If your keys are random, or based upon machine name, this could be the cause.

I'm appending from a cursor into TreeView, and I found it helpful to browse the cursor for suspicious values when I got such messages during testing.

FWIW