Dear Charles @willic3 ,
I have turned of linear interpolation but it is still giving me the same error.
I have tried also to simplify the coordinate (2-3 digits after comma) in my coseismic spatial database and all the required original lon-lat coordinates in the spatial database. But it doesn’t work. I suspect that it is not because of the coseismic spatial database. Because I try to run the interseismic simulation and use slip-dependent for the creep slip (variation only along z. x and y = 0), it gives me the same issue. I have asked others who have done the same 3D subduction simulation but they use tmerc and geo-local-cartesian. While mine is in UTM.
I attached below all my files. Could you please help me to find the solution?