Stepchart creation failed!

invalid SM file: measure with a strange number of notes (23 notes at line 58), notes are: array(23) { [0]=> string(4) "1000" [1]=> string(4) "0001" [2]=> string(4) "1000" [3]=> string(4) "0001" [4]=> string(4) "1000" [5]=> string(4) "0001" [6]=> string(4) "1000" [7]=> string(4) "0001" [8]=> string(4) "1000" [9]=> string(4) "0001" [10]=> string(4) "1000" [11]=> string(4) "0001" [12]=> string(4) "1000" [13]=> string(4) "0001" [14]=> string(4) "1000" [15]=> string(4) "0001" [16]=> string(4) "1000" [17]=> string(4) "0001" [18]=> string(4) "1000" [19]=> string(4) "0001" [20]=> string(4) "1000" [21]=> string(4) "0001" [22]=> string(4) "1000" }