std::thread --- no matching constructor

So, I have this bit of code, which is supposed to be run as a separate thread:

template<class Iterator>
void thread_launcher(Iterator start, Iterator fin, size_t sort_type) {
    // Blah blah
    mixed_sort<less<int>>(start, fin, sort_type);
    // blah blah
}

And this code is supposed to create this thread:

for (size_t sort_type = 2; sort_type!= 7; ++sort_type) {
    // blah
    t[sort_type] = thread(thread_launcher, copy.begin(), copy.end(), sort_type);
}

, where t is an array of thread.

The problem is --- when I try to compile this, I get this error:

main.cpp:245:32: error: no matching constructor for initialization of
      'std::__1::thread'
  ...= thread(thread_launcher, copy.begin(), copy.end(), sort_type);
       ^      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/http://ift.tt/YWy3MO: note: 
      candidate template ignored: couldn't infer template argument '_Fp'
thread::thread(_Fp&& __f, _Args&&... __args)

I don't understand what did I do wrong, though it's the first time I've ever worked with multithreading, let alone std::thread. What should I do to fix this?