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Hello @patrick1245,
The error may occur due to the rules in the .htaccess file or incompatibility with another of the installed plugins of the application.
The recommended course of action would be to restore the application from a restore point when it was working as intended.
If you are a SiteGround customer, you can post a ticket through your Client Area so we can check what may be causing the reported behavior.
Best Regards,
Stefan Stefanov