World of Warcraft Basic is a cesspool of bugs, errors, and glitches—error code 51900101 being a main instance.
The error code tends to crop up within the Basic and Burning Campaign Basic variations of the sport, abruptly disconnecting you from the servers, and stopping you from logging again in and taking part in the sport.
The quickest and most dependable strategy to clear up this challenge is to delete your WoW cache folder. Doing this can reset your person interface, keybindings, and addons.
If you wish to protect your settings, take into account taking a couple of screengrabs simply to be sure to don’t lose something of significance/ It may be a ache to undergo all of your settings once more and discover the proper settings.
While you’re prepared, head to your World of Warcraft folder, select _classic_, right-click the cache folder, and click on delete or manually transfer the file to the trash. As soon as it’s deleted, a contemporary cache folder will instantly pop up and change the outdated.
If this technique doesn’t work, the issue may stem out of your web service supplier or a firewall, which could possibly be blocking entry to your recreation. If that is so, attempt troubleshooting your web and briefly disabling your firewall.
https://dotesports.com/information/how-to-fix-wow-error-51900101 | Tips on how to repair error code 51900101 in World of Warcraft Basic and Burning Campaign Basic