Stepchart creation failed!

invalid SM file: measure with a strange number of notes (15 notes at line 58), notes are: array(15) { [0]=> string(4) "0001" [1]=> string(4) "0100" [2]=> string(4) "0001" [3]=> string(4) "10M0" [4]=> string(4) "0000" [5]=> string(4) "0001" [6]=> string(4) "1000" [7]=> string(4) "00M0" [8]=> string(4) "0100" [9]=> string(4) "1000" [10]=> string(4) "0001" [11]=> string(4) "10M0" [12]=> string(4) "0000" [13]=> string(4) "0001" [14]=> string(4) "0000" }