The user's temporary directory may occasionally be pruned by Windows in ways which break the stash.
The 'Error' status applies to nodes which could not be created for some
reason. It has a negative integer value, so that
> 0 queries looking
for nodes to update will skip it.
Nodes in this status probably require manual intervention to fix.
Bluewire.IntervalTree: 3.0.0 -> 3.1.0