+++ This bug was initially created as a clone of Bug #874405 +++

Description of problem:

Add an alias to app  which belongs to one account,and try to add the same alias to another app which belongs to another account,can not add successfully,but have not meaningful error message,will prompt like:Node execution failure (invalid exit code from node).  If the problem persists please contact Red Hat support.
Should have meaningful prompt for user.

Version-Release number of selected component (if applicable):

OpenShift Enterprise puddle: 1.1.x/2013-01-14.3
rhc 1.3.2 from the puddle

How reproducible:
Always

Steps to Reproduce:
1.Create an app(app1) using one account
rhc app create -a app1 -t php-5.3 -l wsun@redhat.com
2.Create another app(app2) using another account 
rhc app create -a app2 -t php-5.3 -l wsun+1@redhat.com
3.Add alias for app1
rhc alias add app1 test.com
4.Add the same alias for app2
rhc alias add app2 test.com

Actual results:
3.[sunwei@dhcp-8-229 dev]$ rhc alias add rack8test test.com -l wsun+1@redhat.com
Password: ******
RESULT:
Application event 'add-alias' successful

4.[sunwei@dhcp-8-229 dev]$ rhc alias add rack9test test.com -l wsun@redhat.com
Password: ******
Node execution failure (invalid exit code from node).  If the problem persists please contact Red Hat support.

Expected results:

Show meaningful prompt:
 The alias is already in use.

Additional info: