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Error: Run-time error '35601' : Element not found

Error Message

Sometimes, when deleting tools and toolsets in 'My Tools,' the following error will occur:

ESRI ArcToolbox
Run-time error '35601':
Element not found

Cause

The application keeps an index of the tools in 'My Tools.' Deleting a toolset that contains tools does not always update this index properly; thus, an error occurs.

Solution or Workaround

To avoid this error, delete the tools first, then delete the toolsets.