There are several possible causes for this situation, so you may need to investigate several possibilities to resolve it.
Do the following:
- Check that the syntax is correct, the input datasets exist as specified and are valid, and that you can write to the output location.
- Ensure that you have sufficient resources on your machine to complete the process.
- Review the documentation for any notes or usage tips that may apply.
- Contact Esri technical support if you cannot resolve the problem.