Hello.
I have the same issue. I have PHP version 7.3 installed.
I didnt use the composer when installed, is that a problem? Im not sure how to use a composer. I just copied all the files into the root folder on my ftp server.
I dont have access to server logs either.
I also got this error, when enabled the php error logs:
https://imgur.com/Dz8TRHA
Thansk for your help.
Best regards,
Emil