elementor popup section problam

Hii wont to create a pop up in elementor with the ticketing template and it does not open the elementor and creates an error Return type of SendGridV3\Mail::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice we purchased the 200$ seating templatei don't understand why it is happeningpleas help Thanks Lirona