Stepchart creation failed!

invalid SM file: measure with a strange number of notes (21 notes at line 1058), notes are: array(21) { [0]=> string(4) "1010" [1]=> string(4) "0000" [2]=> string(4) "0100" [3]=> string(4) "0010" [4]=> string(4) "0100" [5]=> string(4) "1010" [6]=> string(4) "0000" [7]=> string(4) "0100" [8]=> string(4) "0010" [9]=> string(4) "0100" [10]=> string(4) "0000" [11]=> string(4) "0001" [12]=> string(4) "0000" [13]=> string(4) "0110" [14]=> string(4) "0000" [15]=> string(4) "1000" [16]=> string(4) "0001" [17]=> string(4) "1000" [18]=> string(4) "0000" [19]=> string(4) "0100" [20]=> string(4) "0000" }