My shopify page does not load anymore after connecting domain to 3rd party app

Hi Shopify,

Today I connected mailerlite to my shopify to use it for my service.

But unfortunatly my page does not load anymore after I did this…

(See screenshot)

I can enter my page from my shortcuts on google. but when I type my domain in search the url does not work anymore.

Maybe I did something wrong while autheticating my domain to mailerlite.

How can I fix this?