I ran across this error while running my Strategy Optimization:
Unhandled exception: Cannot modify the logical children for this node at this time because
a tree walk is in progress.
The Optimization continued running in the background so it doesn't look like a critical erro.
From support archive search, I see someone reported this a while back when NJT 8 was in beta:
I have a screen shot and Log/Trace files, along with the Strategy CS if you want it as well.
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