Why does a 32 Bit MATLAB crash on a 64 Bit sytem when running a MEX file?

*Mex <file:*> myfunc.mexw32

OS architecture: 64 Bit

MATLAB architecture: 32 Bit

Compiler: Microsoft Visual SDK 7.1

*Dependency walker results on MEX file: *

Error: At least one required implicit or forwarded dependency was not found.

Error: At least one module has an unresolved import due to a missing export function in an implicitly dependent module.

Error: Modules with different CPU types were found.

System cannot find LIBMEX.DLL and LIBMX.DLL.

Question

How do I solve this problem? Does this error happen because of the difference in OS and MATLAB BIT?