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Runtime sc_spawn exception


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the code below throws the exception:


Error: (E519)wait() is only allowed in SC_THREADs and SC_CTHREADs :
in SC_METHODs use next_trigger() instead
In file : ..\..\src\sysc\kernel\sc_wait.cpp:92
Although I understand that a spawned method qualifies as a thread, I tried to replace the wait call with next_trigger and still get the same exception at runtime.
Thanks in advance, 
// main.cpp
#include <systemc>
#include "my_module.h"

using namespace sc_core;

int sc_main(int argc, char* argv[])
   my_module my_module_i("my_module_i");
   return 0;
// my_module.h
#ifndef MY_MODULE_H
#define MY_MODULE_H
#include <systemc>

   my_module(sc_core::sc_module_name nm);
   void my_thread(void);
// my_module.cpp
#include <iostream>
using std::cout;
using std::endl;

#include <systemc>
using namespace sc_core;

#include "my_module.h"

my_module::my_module(sc_module_name nm)
: sc_module(nm)
   try {
          sc_spawn(sc_bind(&my_module::my_thread, this), "my-thread")
   catch (const sc_report& x){
      cout << "Ooppss..." << endl;
      cout << x.what() << endl;

void my_module::my_thread(void) {
   cout << "INFO: spawned thread "
          << sc_get_current_process_handle().name()
           << " @ " << sc_time_stamp() << endl;
   wait(10, SC_NS);
   // next_trigger(10, SC_NS);


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