Please help me on turning Fuzzy PID controler into 2D lookup table.

Can you please help me... I have a problem when I am making 2D look up table, from .fis file. I use evalfis function, but it only works when I have 1 output in .fis file, but my .fis file has 3 outputs. And then MATLAB shows me this:

'Error using evalfis (line 70)

Input data must have as many columns as input variables and as many rows as independent

sets of input values.

Error in Lookup (line 21)

LookUpTableData_s = evalfis([S DS],fis_skr);'

please help if you know. Thanks in advance!