human
Solve the following python programming problem given the following code:
def render_GET(self, request) : 
    def _render(result, r) : 
        if (not r.finished) : 
            r.setHeader ('Content-Type', 'text/plain') 
            r.setHeader ('Content-Length', str (len (result))) 
            r.setHeader ('Pragma', 'no-cache') 
            r.setHeader ('Cache-Control', 'no-cache') 
            r.write (result) 
            r.finish () 
try : 
            config.reactor.callLater (config.DRONED_PRIME_TTL, drone.releasePrime, int (result)) 
except : 
            pass 
d = drone.getprime () 
    d.addCallback (str) 
    d.addCallback (_render, d) 
    return server.NOT_DONE_YET 

    
    

    Fix the buggy line: d.addCallback (_render, d)
assistant
#Here is Python program to fix the buggy line: d.

d.addCallback (_render, request)