@cuonglm Please provide your configuration and how you are accessing the web interface.
What is a blank page? Do you see the agola top bar? If so you should first create a remote source and then click on register to register an user.
Your browser is calling the agola gateway on http://192.168.64.20:30002. Is it right? Are you sure your browser can access that url?
This error at startup is normal since the runservice component could not yet be started when the scheduler component tries to access it so it’s not related.