Endless loading of the first screen

Hi all! I encountered a problem when deploying rocketchat after installation in any possible way (versions of mongo and nodeJS corresponding to the guide) when switching to localhost:3000 I am met with an endless download that does not complete. if you click the left mouse button → inspect → console displays the error “Content-Security-Policy: The page’s settings blocked the loading of a resource at inline (“script-src”).”
but the download is still spinning. all steps have been done in accordance with the official guide many times
installed on ubuntu 22.04