Another qkview is running. You can't run multiple instances of qkview at once.

[Cowboy Denny]

This happens for a couple reasons

someone else is running a qkview (could be another user or an application like BIG-IQ)

qkview got hung while trying to create a qkview for one reason or another

 

So how to fix it?

Just run the following command and try running qkview again

rm /var/tmp/.qkview_lock