SNAPHU Unwrapping - Tile overlap is small/Tiles to small or overlap too large for given input

Hi,

Executing the Unwrapping in SNAPHU, I got the error “Tile overlap is small”

My configuration was:

The phase and coherence images are below, with size of 1271x2536.


I tried again, changing the number of tiles rows and tiles columns to 50, keeping row and column overlap to 0. In this time, I got the following error “Tiles to small or overlap too large for given input”

How can I solve this? The subset of my image is too small? How to know the correct number of tiles and overlap?
I know that the coherence in my study area is low, but I got some fringes in interferogram that I would like to analyse. I used 2 images, one from 11 March and the other from 27 Feb.

Thanks very much for your help.