Stepchart creation failed!

invalid SM file: measure with a strange number of notes (23 notes at line 839), notes are: array(23) { [0]=> string(4) "0000" [1]=> string(4) "0000" [2]=> string(4) "0000" [3]=> string(4) "0000" [4]=> string(4) "0000" [5]=> string(4) "0310" [6]=> string(4) "0000" [7]=> string(4) "0000" [8]=> string(4) "0000" [9]=> string(4) "0000" [10]=> string(4) "0000" [11]=> string(4) "0000" [12]=> string(4) "0000" [13]=> string(4) "0000" [14]=> string(4) "0000" [15]=> string(4) "0000" [16]=> string(4) "0002" [17]=> string(4) "0000" [18]=> string(4) "0000" [19]=> string(4) "0000" [20]=> string(4) "0000" [21]=> string(4) "0000" [22]=> string(4) "0000" }