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From a clean install, exeute these commands:

provider create --org ACME_Corporation --name katello --type custom
provider delete --org ACME_Corporation --name katello


you will get back the following error client side, and in the katello.log file

error: operation failed: undefined method `to_sym' for nil:NilClass


Versions:
katello-0.1.64-1.git.0.0b431ff.fc15.noarch
katello-cli-0.1.4-1.git.63.54683c2.fc15.noarch

Fixed in commit 82404fd22e971.

Related to bug https://bugzilla.redhat.com/show_bug.cgi?id=727627 (the same type of error)

Caused by incompatibility of Rails with fast_gettext - https://github.com/grosser/fast_gettext/issues/23

# VERIFIED

The issue is fixed now.

repeat of the scenario in bug description brings to:
---
Deleted provider [ katello ]
---

And the provider really gets removed (provider list --org ACME_Corporation)

Checked against: 
katello-cli-0.1.10-1.git.278.85760dc.el6.noarch
katello-0.1.83-1.git.48.02111ba.fc15.noarch

getting rid of 6.0.0 version since that doesn't exist