Handle errors without closing connection

Hi all.
Hi all. I want to implement "redeclare exchange" for myself, but I lose connection every time, when get Error "530, NOT_ALLOWED - cannot redeclare exchange".
Is there any way to handle errors without closing connection?

Code:
try:
        yield channel.exchange_declare(exchange=name, type=type, durable=durable, auto_delete=auto_delete)
except Exception, mess:
        print 'E1: %s'%mess
        yield channel.exchange_delete(exchange=name) # here is another error: close [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionDone'>: Connection was closed cleanly.
        yield channel.exchange_declare(exchange=name, type=type, durable=durable, auto_delete=auto_delete)

thanks.