Which plugin was the cause?
Note: there is also a German-language support forum: https://de.wordpress.org/support/forums/
I assume you mean Avada. This is a commercial theme, and I would recommend contacting their support team: https://avada.com/help-center/ – questions about commercial products cannot be answered here in the forum.
But wordpress stopped the page from working?!?
You wrote that you disabled the plugin causing the error. This was apparently the commercial theme Avada or its associated plugins. Unfortunately, I don’t know exactly what PHP-error you saw here, but based on your description, Avada is to blame for the error. Therefore, you need to contact their support team to clarify this.
Alternatively, you can try importing a backup of your project. If you don’t have a backup yourself, ask your host’s support team. The disadvantage of this approach is that the error may occur again, e.g. if Avada installs an update.
If you are still unsure about the cause, you are welcome to show us the PHP error you are seeing. Then we could tell you more specifically what the cause is.
