about "Roughness total does not match sectoral analysis" another!

[ssroot]

have above error,but when i use large resolution,the soft can do the calculation without error,
but use small resolution ,this error comes every time.Could anyone can explain it?

[Duncan]

How big is the resource grid? How large is the map?

Are you using WAsP 9, 10 or 11?

Please mail the contents of "Help > WAsP on this computer..." to me, and we can check some file versions.

Duncan.