B1 UP Macro :SortColumn not working on UDO

Hi Everyone,

I would like to use the function botton and Maceo command "SortColumn" to sort the matrix

At first it worked successfully on S/O

But once I want to do it again on my UDO,system told me that I can't sort matrix by the Column

I tried every column on my matrix and got the same error message

Does it mean the macro command can't work on UDO?