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I am using elementary OS. When AppCenter is opened, a message is popped up with below message: does not have a Release file

E: The repository 'http://ppa.launchpad.net/versable/elementary-update/ubuntu bionic Release' does not have a Release file.

W: Updating from such a repository can't be done securely, and is therefore disabled by default.

W: See apt-secure(8) manpage for repository creation and user configuration details**

Also 'sudo apt-get update' gives result as:

Hit:7 http://ppa.launchpad.net/philip.scott/elementary-tweaks/ubuntu bionic InRelease
Ign:8 http://ppa.launchpad.net/versable/elementary-update/ubuntu bionic InRelease
Err:9 http://ppa.launchpad.net/versable/elementary-update/ubuntu bionic Release
404 Not Found [IP: 91.189.95.83 80] Reading package lists... Done E: The repository 'http://ppa.launchpad.net/versable/elementary-update/ubuntu bionic Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
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To solve the error open terminal and run:

sudo add-apt-repository --remove ppa:versable/elementary-update

For hash sum mismatch run:

sudo rm -rf /var/lib/apt/lists/*

Now run:

sudo apt-get update
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