Solved. I didn't give the machine enough memory.

I'm keen to get mining but i keep getting the following error? I'm using Debian 7.0 on Digital Ocean.

user@xxx:~/ProtoShares/src# ./bitcoind -daemon
user@xxx:~/ProtoShares/src# ProtoShares server starting
^C
user@xxx:~/ProtoShares/src# ./bitcoind setgenerate true 3
user@xxx:~/ProtoShares/src# terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc

Any ideas?