用mideva将m文件转化为dll，老是出错显示如下应该怎么做

Error D:\大三上\matlab\findedge.m 18: 'E = imopen(E,strel('disk',15));'
'imopen' was not found. Please debug the code.
Error D:\大三上\matlab\findedge.m 18: 'E = imopen(E,strel('disk',15));'
'strel' was not found. Please debug the code.
Error D:\大三上\matlab\findedge.m 20: 'E=edge(E,'sobel');'
'edge' was not found. Please debug the code.
Compiling...
Done.

VB版？

恩，vb版

matlab跟vb不是同一个语言吧？