Plugin errors cause WordPress to malfunction. It can occur even if you are not updating your plugins on a regular basis.
To resolve plugin-related errors, find the plugin that is causing the error and deactivate it. An error message shows stating which plugin is causing the error. If the error message does not specify the error-causing plugin, then you can find the plugin manually and deactivate it.
How to deactivate a faulty plugin in WordPress?
1. Using your account credentials login to your WordPress admin dashboard.
2. Then click on the Plugins option present on the lefthand corner.
4. Select all the plugins to present here and click on Deactivate option present in the Bulk Action menu.
5. After that click on the Apply button. If the error is not gone after deactivating all the plugins, then the plugins are not causing the error. If the error is gone, then one or more than one plugin is corrupted.
6. To locate the error-causing plugin, activate the plugins one after another. You can activate the plugins by clicking on the Activate button present below the plugin name.
7. After activating one plugin go to the website and see if the error is gone or not.
8. Repeat this process until you have found the error-causing plugin. Once you find out the plugin that is causing the error, deactivate it.
Now your website will be working fine.