White page in front office


Sorry for my broken English, I am French speaking.

I am on a LiteSpeed server at PlanetHoster.
I have a Prestashop 1.6 modified to work with Php 7.3
I installed the LSCache v1.4.0 module found here.

As soon as I activate it, I find myself with a blank page in the front office.
As soon as I deactivate it, I find my site.
Can you help me please ?
I've already asked PlanetHoster support for help but they can't find the problem ...

Kind regards,