error with RabbitMQ on iOS - ios

Question

In my iOS app I'm using RabbitMQ wrapper from https://github.com/bimawa/AMQProtocol
AMQPConnection *connection = [[AMQPConnection alloc] init];
NSError *error,*error1,*error2;
[connection connectToHost:server onPort:port error:&error];
[connection loginAsUser:login withPasswort:password onVHost:#"/" error:&error1];
AMQPChannel *channel = [connection openChannelError:&error2]; // Get error here!
On the last line I get the error "Failed to open a channel":
2014-06-27 11:17:06.094 MyApp[40055:60b] TCLib>> AMQPException AMQP_RESPONSE_LIBRARY_EXCEPTION: Failed to open a channel: Argument list too long
2014-06-27 11:17:06.107 MyApp[40055:60b] TCLib>> open channel error: Error Domain=AMQPChannel Code=-5 "Failed to open a channel" UserInfo=0x9abe330 {NSLocalizedDescription=Failed to open a channel}
Server, host, login and password are working. I've checked them on android app.
Can't find out why it fails to open a channel. Can you recommend something?

Answer 1

may be its too late for answer but may be it's helpful for other.:)
in my situation the problem was from i had error in login to 'vhost' or the
[connection loginAsUser:login withPasswort:password onVHost:#"/" error:&error1];
line and i was trying to open the channel of null connection .
the problem was permission check mechanism in rabbit server.
update:
for example check the error after each line that you pass it to a method like this:
if(error!=nil){
NSLog(#"%#",error);
return;
}