Error on Fedora 26 " Could not open X display"

Hi dear members,

Im trying to install vmware-worstation(14) , but when i will enter key licence like "sudo /usr/lib/vmware/bin/vmware-enter-serial" .
I have the error below :


No protocol specified

** (vmware-enter-serial:27277): WARNING **: Could not open X display
No protocol specified

(vmware-enter-serial:27277): Gtk-WARNING **: cannot open display: :0


And i have added Defaults env_keep=DISPLAY , into /etc/sudoers .


Does any one have ideas


Thanks a lot

Seddik

I have solved the probleme enter :
#xhost +local:root
And restarted the machine after adding Defaults env_keep=DISPLAY into /etc/sudoers

Regards,
Seddik