[OS X] What can cause dlopen: no suitable image found (can't map)?

Question

What can cause the following error when loading an additional bundle using dlopen:

dlopen($(OBJ_DIR)/Test-20091217211256.ob, 6): no suitable image found.  Did find:
    $(OBJ_DIR)/Test-20091217211256.ob: can't map

Before this error, the process allocates large amounts of memory.

(Substituted $(OBJ_DIR) in the error for the actual path to make it more legible).

Answer 1

1. 32 bit shared object on 64-bit operating system?

2. missing dependencies?