umh seems my GitHub report has been closed.
I still think the new Beta has some issue on install on localhost, for me work only if i do all the installation by command line. If i point the browser after generating files and compile with database data and everting get errors as many user i can see.
Anyway issue on GitHub created and closed (not from me) 😃 reported and discussed also here. I think i cannot do more for now about this. I understood is better on localhost, for now, continue the install with php flarum install
.