Cannot install application on CentOS 7, exiting on user cancel error

I have CentOS 7 installed on my virtualbox. I havent run or power on this virtual machine for a while and now I want to install some packages on it. But, I got the following error message on Terminal when I run yum command

[root@localhost fitri]# yum install plank
Loaded plugins: fastestmirror, langpacks

Exiting on user cancel

I tried to install another package but got the same error.

exiting on user cancel


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