Written by Admin on 2025-05-06

Troubleshooting "Page Builder Sandwich WordPress Cannot Read Property ClassList of Null" Error

When trying to create or edit a page on WordPress using the Page Builder Sandwich plugin, some users may encounter an error message that reads "Cannot read property classList of null". This error can be frustrating and may prevent users from making any further changes to their website. However, there are a few steps you can take to troubleshoot and fix this issue.

What Causes the Error?

This error message appears when the plugin is unable to load the page builder properly. The root cause of this error is often related to conflicts with other plugins or outdated software and browsers. Sometimes, the error message may also appear due to corrupt files or incomplete installations.

Steps to Fix the Page Builder Sandwich Error

Below are some steps you can take to resolve the "Page Builder Sandwich WordPress Cannot Read Property ClassList of Null" error:

1. Check for Conflicts with Other Plugins

The first step you should take is to check if the error message is triggered by a conflict with other plugins on your website. Temporarily deactivate all the plugins except Page Builder and see if the error persists. If the error goes away, reactivate each plugin one by one until you find the conflicting plugin. Once you identify the conflicting plugin, consider updating or replacing it with an alternative.

2. Update Your Website

Make sure that your website is running on the latest version of WordPress, Page Builder Sandwich, and other plugins. Outdated software can cause conflicts and incompatibilities, resulting in errors like "Cannot read property classList of null". To update your website, navigate to the WordPress dashboard and click on "Updates" to install the latest updates.

3. Clear Your Browser Cache

Another common cause of this error is an overcrowded browser cache. Clear your browser cache and try accessing the Page Builder again. If the error persists, try using a different browser to see if the problem is related to browser incompatibility.

4. Reinstall Page Builder Sandwich

If the error message still persists, try reinstalling the Page Builder Sandwich plugin. First, deactivate and delete the plugin from your website, and then reinstall it from the WordPress repository or an updated version from the official source.

Conclusion

The "Page Builder Sandwich WordPress Cannot Read Property ClassList of Null" error can be frustrating and time-consuming to troubleshoot. However, by following the steps outlined above, you can identify and resolve the issue quickly. In most cases, this error can be resolved by updating your website, checking for conflicts with other plugins, clearing your browser cache, or reinstalling the Page Builder Sandwich plugin.