staion did you check storage/logs/flarum.log and your web server logs ?
You might want to increase the memory or execution time of PHP. If you're able to access one of Bazaar page there is an icon telling you if you meet the minimum requirements. (I realize we haven't listed those in the README)
You can also try enabling debug mode to see if the front-end gives you a better error message.
If you still experience issues could you create an issue at https://github.com/flagrow/bazaar/issues with details about your setup (OS, webserver, php version, php flarum info content, ...)
