@Girtablulu Didn't work.
@Phenogram Not worked that too because it was already installed. That command is to update it.
What I did to fix it, is that I removed snap-store and then installed it again. But this time didn't opened it after install but just restart PC, to respect the warning message.
sudo snap install snap-store
Password:
Warning: /snap/bin was not found in your $PATH. If you've not restarted your
session since you installed snapd, try doing that. Please see
https://forum.snapcraft.io/t/9469 for more details.
snap-store 20190523.d681b8f from Canonical✓ installed
Now it is working fine.