Description
The tool could not be accessed and executed properly.
Solution
If the tool belongs to a custom toolbox, ensure that the toolbox has been previously added. Learn more about adding and removing toolboxes. In addition, it is possible that the tool is not currently valid and cannot be used. For instance, a custom model tool that shows a broken state cannot be executed without being repaired. For a server tool, the tool will be invalid if the server is not found.