does compiler4.0 support user defined class?

I used one SVM toolbox, which has some user defined class, such as
'algorithm','data'. I save one object of class 'algorithm', and then
load by one matlab function. When I compiled this function by
compiler4.0 in MATLAB7. An stand-alone executable file was generated.
But when I run it, there is the warning:':all:' is an unknown object
class, Object 's' of this class has converted to a structure. The
matlab source function is only one sentence: load svm_para s

So why does this warning come out?
The important thing about this is that this convertion will affect
the following sentences, and finally, there are some errors.

Any hints is appreciated!