Error "Disallowed system call: SYS_kill" as I try to remove all consecutive duplicate elements from a string

The following

#include <iostream>
#include <string>

void remove_duplicates ( std::string & s )
{

   for (std::string::iterator it(s.begin()), offend(s.end()); it != offend; ++it)
   {
      std::string::iterator temp = it;
      while (++it != offend && *it == *temp);
      if ((it-temp)>1) s.erase(temp, it);
   }
}


int main()
{
   std::string str = "aaabbcaaaaa";
   remove_duplicates(str);
   std::cout << str; /* Expected output: "abca" */
   return 0;
}

is producing the error

/usr/local/lib/gcc/i686-pc-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/basic_string.h:1154: __gnu_cxx::__normal_iterator::other::pointer, std::basic_string<_CharT, _Traits, _Alloc> > std::basic_string<_CharT, _Traits, _Alloc>::erase(__gnu_cxx::__normal_iterator::other::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator::other::pointer, std::basic_string<_CharT, _Traits, _Alloc> >) [with _CharT = char, _Traits = std::char_traits, _Alloc = std::allocator]: Assertion '__first >= _M_ibegin() && __first <= __last && __last <= _M_iend()' failed.

Disallowed system call: SYS_kill

when I run it on http://ift.tt/1DtkBwR.

Is there a problem with the logic of my function? If so, what is it, and is there a cleaner way to solve the problem?