human
Solve the following python programming problem given the following code:
def __call__(self, environ, start_response) : 
    catch_response = [] 
    body = [] 
    def replace_start_response(status, headers, exc_info = None) : 
        catch_response.extend ([status, headers]) 
        start_response (status, headers, exc_info) 
        return body.append 
def run_app() : 
        app_iter = self.app (environ, replace_start_response) 
        try : 
            body.extend (app_iter) 
finally : 
            if hasattr (app_iter, 'close') : 
                app_iter.close () 
self.lock.acquire () 
    try : 
        prof = hotshot.Profile (self.log_filename) 
        prof.addinfo ('URL', environ.get ('PATH_INFO', '')) 
        try : 
            prof.runcall (content_type) 
finally : 
            prof.close () 
body = ''.join (body) 
        headers = catch_response [1] 
        content_type = response.header_value (headers, 'content-type') 
        if ((content_type is None) or (not content_type.startswith ('text/html'))) : 
            return [body] 
stats = hotshot.stats.load (self.log_filename) 
        stats.strip_dirs () 
        stats.sort_stats ('time', 'calls') 
        output = capture_output (stats.print_stats, self.limit) 
        output_callers = capture_output (stats.print_callers, self.limit) 
        body += ('<pre style="%s">%s
%s</pre>' % (self.style, cgi.escape (output), cgi.escape (output_callers))) 
        return [body] 
finally : 
        self.lock.release () 

    
    

    Fix the buggy line: prof.runcall (content_type)
assistant
#Here is Python code to fix the buggy line: prof.

prof.runcall (def run_app()