Black screen instead of the expected document

[stemy2]

Hello,

I had many problems with onlyoffice because rabbitmq was unable to start. I upgraded it and now, the said server says it works, but when i open a document in my nextcloud instance, instead of opening it with onlyoffice, does nothig but giving a black screen. I don't even have onlyoffice's toolbars, just the favicon. The onlyoffice's url specified in the nextcloud's parameters is right, and reciprocally, so i don't understand what did i missed.