error: use of deleted function

Question

I've been working on some C++ code that a friend has written and I get the following error that I have never seen before when compiling with gcc4.6:

error: use of deleted function

‘GameFSM_<std::array<C, 2ul> >::hdealt::hdealt()’ is implicitly deleted because the default definition would be ill-formed:
uninitialized non-static const member ‘const h_t FlopPokerGameFSM_<std::array<C, 2ul> >::hdealt::h’

Edit: This comes from a part of the code using boost MSM: Boost Webpage

Edit2: There is no = delete() used anywhere in the sourcecode.

Generally speaking, what does this error mean? What should I be looking for when this type of error occurs?