Using ww3_shel for self-nesting, ran into a problem.

[nYifeiLee]

First, let me describe my nesting areas. The large-scale region is defined from 17° to 41°N latitude and from 133° to 140°E longitude, with a grid resolution of 10′（0.1667°）. The small-scale region spans from 21° to 35°N latitude and from 117° to 133°E longitude, with a grid resolution of 6′（0.1°）.
When the grid resolutions of both the large and small scales are the same (both at 10′), I ensure that the latitude and longitude increments (DX, DY) under "Output boundary points" in the ww3_grid.inp of the large-scale area match the resolution of the small-scale grid. By excluding land points within the small-scale nesting boundary, nesting can proceed normally.
However, when the resolutions differ between the large and small scale areas, and I try to keep the latitude and longitude increments (DX, DY) in the large scale consistent with the small-scale grid resolution, the nesting process fails to operate correctly. I've attempted numerous methods to solve this issue. For instance, excluding land points from the large-scale output boundary, excluding land points within the small-scale input boundary, or comparing the output and input boundaries to exclude any land points whether they are on the input or output boundary. Nonetheless, it still doesn't work. I'm unsure where the problem lies.

Below are screenshots of the relevant sections in the ww3_grid.inp files for the large and small areas under different scenarios.
When the grid resolutions of both the large and small scales are the same：

When the resolutions differ between the large and small scale areas:

[nYifeiLee]

ERROR: