oc-cluster destroy failed for reason "Permission denied".

[warmchang]

Run oc-cluster destroy failed for reason "Permission denied":

[root@appab-myproject ~]# oc-cluster list
# Using client for origin v1.5.1
Profiles:
- example
- workshop
- workshop2
[root@appab-myproject ~]# oc-cluster status
# Using client for origin v1.5.1
no cluster running
[root@appab-myproject ~]# oc-cluster destroy workshop2
# Using client for origin v1.5.1
Are you sure you want to destroy cluster with profile <workshop2> (y/n)? y
Removing profile workshop2
Removing /root/.oc/profiles/workshop2

/usr/bin/rm: cannot remove '/profiles/workshop2': Permission denied
Removing .kubeconfig profiles
error: cannot delete cluster workshop2, not in /root/.kube/config
error: cannot delete context workshop2, not in /root/.kube/config
Removing 0 images built with this cluster
[root@appab-myproject ~]#
[root@appab-myproject ~]# oc-cluster list
# Using client for origin v1.5.1
Profiles:
- example
- workshop
- workshop2

The docker version & OS version:

[root@appab-myproject ~]# docker version
Client:
 Version:         1.12.6
 API version:     1.24
 Package version: docker-1.12.6-28.git1398f24.el7.centos.x86_64
 Go version:      go1.7.4
 Git commit:      1398f24/1.12.6
 Built:           Fri May 26 17:28:18 2017
 OS/Arch:         linux/amd64

Server:
 Version:         1.12.6
 API version:     1.24
 Package version: docker-1.12.6-28.git1398f24.el7.centos.x86_64
 Go version:      go1.7.4
 Git commit:      1398f24/1.12.6
 Built:           Fri May 26 17:28:18 2017
 OS/Arch:         linux/amd64
[root@appab-myproject ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
[root@appab-myproject ~]#

Any advice to resolve this? thanks.