AttributeError: module 'thread' has no attribute 'start_new_thread'

I'm new to pycharm and I found it's a very good IDE for Python programming.

But I've one problem everytime I want to debug a script I get the follwoing error message:

Traceback (most recent call last):
 File "C:\Apps\PyCharm\plugins\python-ce\helpers\pydev\pydevd.py", line 2270, in <module>
   main()
 File "C:\Apps\PyCharm\plugins\python-ce\helpers\pydev\pydevd.py", line 2252, in main
   globals = debugger.run(setup['file'], None, None, is_module)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "C:\Apps\PyCharm\plugins\python-ce\helpers\pydev\pydevd.py", line 1521, in run
   self.prepare_to_run()
 File "C:\Apps\PyCharm\plugins\python-ce\helpers\pydev\pydevd.py", line 1405, in prepare_to_run
   self.patch_threads()
 File "C:\Apps\PyCharm\plugins\python-ce\helpers\pydev\pydevd.py", line 1425, in patch_threads
   patch_thread_modules()
 File "C:\Apps\PyCharm\plugins\python-ce\helpers\pydev\_pydev_bundle\pydev_monkey.py", line 943, in patch_thread_modules
   patch_thread_module(t)
 File "C:\Apps\PyCharm\plugins\python-ce\helpers\pydev\_pydev_bundle\pydev_monkey.py", line 906, in patch_thread_module
   _original_start_new_thread = thread_module._original_start_new_thread = thread_module.start_new_thread
                                                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: module 'thread' has no attribute 'start_new_thread'
Process finished with exit code 1

Can anybody help me to solve this problem?