matlab添加了一个sheffield遗传算法工具箱怎么不能用 ,

matlab添加了一个sheffield遗传算法工具箱怎么不能用 ,
Cannot find an exact (case-sensitive) match for 'crtbp'.
Do you want:crtbp
(in D:\my program\matlab2011b\toolbox\my tools\Sheffield\crtbp.M)?
Error in gen12 (line 17)
Chrom=crtbp(NIND,PRECI);