Booking - Error 500 :(

Hi,
A starting question - can e-commerce and booking be on one platform at the same time?
I have a website where e-commerce works well. I wanted to add Booking to this as a supplement. I inserted it as a test and when I try to display it I get error 500 :(
Any suggestions?
https://www.test.pawelzielinski.pl/zapisy-2

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