This is not possible. There must have been something else causing this. Please go to your plugins, access them via ftp. Rename all of them (example: meta-box to meta-box1), except Codeless Builder. By renaming the plugin folder, it automatically deactivates them. Try accessing the admin panel then. If you still can not, do the same with theme’s folder.
If you send us some wp credentials in a private reply. So we can give it a closer look.
