Stepchart creation failed!

invalid SM file: measure with a strange number of notes (7 notes at line 1021), notes are: array(7) { [0]=> string(4) "0000" [1]=> string(4) "0001" [2]=> string(4) "1000" [3]=> string(4) "0100" [4]=> string(4) "0000" [5]=> string(4) "0100" [6]=> string(4) "1000" }