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El problema puede tener muchas razones, la mayoría de ellas relacionadas con la versión de PHP que tienes.
tienes dos pasos que puedes seguir para resolver el problema,

- Verifique si tiene PHP 7,2 y como máximo 7,3 para las últimas versiones de prestashop, PHP 7,4 no se recomienda porque muchos módulos NO LO SOPORTAN.

Y POR ESO SÓLO, PUEDES INTENTAR DESACTIVAR ALGUNOS MÓDULOS DE LA TIENDA, visita FTP la carpeta donde el PRESTASHOP ESTÁ INSTALADO, carpeta MÓDULOS y dentro busca y cambia el nombre de la carpeta PS_MBO a PS_MBO_BACK e intenta lanzar el sitio web nuevamente.

Si funciona ahora, puede intentar visitar la configuración avanzada y verificar si tu tienda usa https o no,

si usa SSL y tienes letsencrypt SSL, puedes crear un registro "CAA" en tu DNS con los parámetros "0 issuewild letsencrypt.org" para forzar el reconocimiento de ssl.

Si está utilizando Cloudflare, puedes intentar omitir el proxy para ver si funciona. también debes desmarcar los parámetros avanzados si la cookie verifica la IP del administrador, o comienza un problema de re-inicio de sesión.

prueba estos pasos para ver si funcionan

----------------- english

the problem can have many reasons, most of them related to PHP version you have.
you have two steps you can do to solve the problem,

- check if you have PHP 7,2 or maximum ver 7,3 for latest prestashop versions, PHP 7,4 is not recommended because many modules DO NOT SUPPORT IT.

AND BECAUSE OF JUST THAT, YOU CAN TRY TO disable SOME MODULES FROM THE SHOP,  visit FTP the folder where you have PRESTASHOP IS INSTALLED, folder MODULES and inside find and rename the folder PS_MBO to PS_MBO_BACK and try to launch the website again.

if it works now you can try to visit advanced settings and check if your shop use https or not,

if you have letsencrypt SSL you can create a "CAA" record in your DNS with params "0 issuewild letsencrypt.org" to force recognition of ssl.

if you are using cloudflare you can try to bypass the proxy to see if it works. also you need to uncheck in advanced params if the cookie check of IP from admin, or it starts a re-login problem.

try these steps to see if they work

the problem can have many reasons, most of them related to PHP version you have.
you have two steps you can do to solve the problem,

- check if you have PHP 7,2 or maximum ver 7,3 for latest prestashop versions, PHP 7,4 is not recommended because many modules DO NOT SUPPORT IT.

AND BECAUSE OF JUST THAT, YOU CAN TRY TO disable SOME MODULES FROM THE SHOP,  visit FTP the folder where you have PRESTASHOP IS INSTALLED, folder MODULES and inside find and rename the folder PS_MBO to PS_MBO_BACK and try to launch the website again.

if it works now you can try to visit advanced settings and check if your shop use https or not,

if you have letsencrypt SSL you can create a "CAA" record in your DNS with params "0 issuewild letsencrypt.org" to force recognition of ssl.

if you are using cloudflare you can try to bypass the proxy to see if it works. also you need to uncheck in advanced params if the cookie check of IP from admin, or it starts a re-login problem.

try these steps to see if they work

the problem can have many reasons, most of them related to PHP version you have.
you have two steps you can do to solve the problem,

- check if you have PHP 7,2 or maximum ver 7,3 for latest prestashop versions, PHP 7,4 is not recommended because many modules DO NOT SUPPORT IT.

AND BECAUSE OF JUST THAT, YOU CAN TRY TO disable SOME MODULES FROM THE SHOP,  visit FTP the folder where you have PRESTASHOP IS INSTALLED, folder MODULES and inside find and rename the folder PS_MBO to PS_MBO_BACK and try to launch the website again.

if it works now you can try to visit advanced settings and check if your shop use https or not,

if you have letsencrypt SSL you can create a "CAA" record in your DNS with params "0 issuewild letsencrypt.org" to force recognition of ssl.

if you are using cloudflare you can try to bypass the proxy to see if it works. also you need to uncheck in the admin the cefification of IP from admin, or it starts a relogin problem.

try these steps to see if they work