AMQP traffic load balanced through VS

Hi. We're also trying to LB a cluster with three rabbitMQ (AMQP) servers.

The traffic on a Standard VS should load balance to the pool members and we put the irule for proxy protocol (https://devcentral.f5.com/codeshare/proxy-protocol-initiator) .

But at the end we have always below error message:

The PROXY protocol header signature was not recognized. (PP 2.1, PP 2.2)  

Anyone can help with this issue? Thanks in advance.