Your result was created from a tool that is no longer valid. Invalid tools will show an invalid tool symbol 
, invalid script 
, or invalid model 
. The tool either cannot be
opened or does not exist. Some causes of this error include:
Solution
For steps to repair an invalid model tool, see the topic Repairing a model.
Solutions for custom tools include:
- Register, or re-register the tool.
- Ensure the tool is implemented and functions properly.