Stepchart creation failed!

invalid SM file: measure with a strange number of notes (9 notes at line 1488), notes are: array(9) { [0]=> string(8) "00020000" [1]=> string(8) "00000000" [2]=> string(8) "00000100" [3]=> string(8) "00030100" [4]=> string(8) "00002000" [5]=> string(8) "00000000" [6]=> string(8) "00000000" [7]=> string(8) "00000000" [8]=> string(1) "3" }