human
Solve the following python programming problem given the following code:
def __call__(self, environ, start_response) : 
    global _threadedprint_installed 
    if environ.get ('paste.testing') : 
        return self.app (environ, start_response) 
if ((not _threadedprint_installed) or (self._threaded_print_stdout is not sys.stdout)) : 
        _threadedprint_installed = True 
        threadedprint.install (leave_stdout = (not self.replace_stdout)) 
        self._threaded_print_stdout = sys.stdout 
removed = [] 
    def remove_printdebug() : 
        removed.append (None) 
environ ['paste.remove_printdebug'] = remove_printdebug 
    logged = StringIO () 
    listeners = [logged] 
    environ ['paste.printdebug_listeners'] = listeners 
    if self.print_wsgi_errors : 
        listeners.append (environ ['wsgi.errors']) 
replacement_stdout = TeeFile (listeners) 
    threadedprint.register (replacement_stdout) 
    try : 
        (status, headers, body) = wsgilib.intercept_output (environ, self.app) 
        if (status is None) : 
            status = '500 Server Error' 
            headers = [('Content-type', 'text/html')] 
            start_response (environ, headers) 
            if (not body) : 
                body = 'An error occurred' 
content_type = response.header_value (headers, 'content-type') 
        if (removed or ((not self.force_content_type) and ((not content_type) or (not content_type.startswith ('text/html'))))) : 
            if (replacement_stdout == logged) : 
                environ ['wsgi.errors'].write (logged.getvalue ()) 
start_response (status, headers) 
            return [body] 
response.remove_header (headers, 'content-length') 
        body = self.add_log (body, logged.getvalue ()) 
        start_response (status, headers) 
        return [body] 
finally : 
        threadedprint.deregister () 

    
    

    Fix the buggy line: start_response (environ, headers)
assistant
#Here is Python program to fix the buggy line: start_response (environ, headers)
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start_response (status, headers)