Snaphu unwrapping finishes in less than a second

Hello, I am an amatuer and I am looking for a solution for my snaphu unwrapping problem. After I selected my I/O and processing parameters and clicked the “run” button the unwrapping process finished immediately in less than a second. It shows immediately 100% even though I know that can not be correct. I followed the TOPS Interferometry Tutorial (http://step.esa.int/docs/tutorials/S1TBX%20TOPSAR%20Interferometry%20with%20Sentinel-1%20Tutorial_v2.pdf). Any suggestions?

Looks like snaphu.exe is not found by SNAP. Have you tried the comments on troubleshooting on page 17?