Hi Andre,
I am getting the same error while performing this tutorial. I also checked using https://dhruvshah.outsystemscloud.com/RichWidgetsSample/ however it gave me error 404.
Regards,
Dhruv
Hi,
I faced the same issue and found that I missed the Link or Button Widget name.
Go to "Add Cast/Crew to Movie Link and Name it as ‘AddCastLink."