Opening Error in Terminal

This is (hopefully) a simple beginning error in finding the disk img library because my OS runs fine otherwise.

Whenever I try to boot Terminal utility I receive this error message displayed:

Code:

dyld: Library not loaded: /usr/lib/libpam.1.dylib
  Referenced from: /usr/bin/login
  Reason: no suitable image found.  Did find:
        /usr/lib/libpam.1.dylib: unknown file type, first eight bytes: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
        /usr/lib/libpam.1.dylib: unknown file type, first eight bytes: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
        /usr/lib/libpam.1.dylib: unknown file type, first eight bytes: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
[Process was terminated by signal 5]

How do I command it to load the correct file image?

Appreciated Already,
~Alchemy