This error happens when number of FIS rules is greater than 250. You should use a smaller FIS (smaller Number of MFs) and use genfis2 instead of genfis1
GENFIS1 uses the grid partitioning and it generates rules by enumerating all possible combinations of membership functions of all inputs; this leads to an exponential explosion even when the number of inputs is moderately large.
This error happens when number of FIS rules is greater than 250. You should use a smaller FIS (smaller Number of MFs) and use genfis2 instead of genfis1
GENFIS1 uses the grid partitioning and it generates rules by enumerating all possible combinations of membership functions of all inputs; this leads to an exponential explosion even when the number of inputs is moderately large.