human
Solve the following python programming problem given the following code:
def build_timeout_circuit(tor_state, reactor, path, timeout, using_guards = False) : 
    '
    returns a deferred which fires when the
    circuit build succeeds or fails to build.
    CircuitBuildTimedOutError will be raised unless we
    receive a circuit build result within the `timeout` duration.
    ' 
    d = tor_state.build_circuit (timeout, using_guards) 
    reactor.callLater (timeout, d.cancel) 
    def trap_cancel(f) : 
        f.trap (defer.CancelledError) 
        return Failure (CircuitBuildTimedOutError ('circuit build timed out')) 
d.addCallback ((lambda circuit : circuit.when_built ())) 
    d.addErrback (trap_cancel) 
    return d 

    
    

    Fix the buggy line: d = tor_state.build_circuit (timeout, using_guards)
assistant
#Here is Python program to fix the buggy line: d = tor_state.

d = tor_state.build_circuit (path, using_guards)