CircleCI 2.0 migration alert still be appeared after migrated

Feedback & Bug Reports
1

My repository migrated CircleCI 2.0 from 1.0.
However, web console still display the migration alert such as

Service alert: Your project references CircleCI 1.0 or it has no configuration. CircleCI 1.0 and projects without configuration files are no longer supported. You must update your project to use CircleCI 2.0 configuration to continue. Learn more.

Is there how can I hide this alert?

2

What is the directory and file name of your 2.0 config? This message seems to indicate that at least one of your branches does not have a 2.0 configuration.

3

This means you still have 1.0 jobs on your jobs page. Once you run enough that they fall off, the message will go away.