Hec-geo HMS Project Area issue

[Eng_A_SH]

Hello.

I'm having an error that says : 

" The spatial index grid size is invalid. [ Project Area ] "

When trying to Generate Project using the hec-geo HMS extension.

How could this problem be fixed ?

Thanks a lot in advance.

[JayantaPoddar]

Could you rebuild the spatial index of the concerned Feature Class(es)?

Restart ArcMap, and run the tool again.

[Eng_A_SH]

Hello, Mr,JayantaPoddar.
Sorry for taking too long.
The link you've provided did not explain thoroughly how to solve the issue, neither did YouTube help while searching for the general key words. 

Best Regards.

[Eng_A_SH · Accepted solution]

I was able to complete this process by starting from scratch. This time using a DEM that has a Geographic coordinate system instead of the Projected coordinate system that I was using.
Thanks for your efforts and have a great day.