AMQP validate failed when add openstack

I used the lastest “darga branch” source code to setup manageiq. When I validate the AMQP during adding openstack, a error occured.

Credential validation was not successful: uninitialized constant ManageIQ::Providers::Openstack::ManagerMixin::Excon

I am sure I do the correct settings.
Any help? Does anyone meet the same problem?

@Ladas can you take a look? Cc @blomquisg

@wangxiangyu strange, I just fetched the latest Darga from github and validation works for me. Even when I put there wrong info, I don’t see this error, but a correct error.

Can you paste a backtrace from your evm.log please?