Hotel Booking Conflict

Hello,
I have a conflict with the PlugIn Hotel Booking.

Im using the Theme TraveWp and when i activate Hotel Booking i get this error message”Fatal error: Cannot declare class Phys_Cart_Totals, because the name is already in use in /home/intravelcom/public_html/wp-content/plugins/travelbookingphys/inc/class-phys-cart-totals.php on line 21″
I attached you an image(Url) with the Error.

My WordPress Version: 5.2.1
My TraveWp version :1.5.9
Can you help me ?
Thank you

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