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It means that the configuration for running Flutter has been removed or lost during the update process. You will need to add the configuration again to the launch.json file in order to run Flutter applications.

To add the configuration, follow these steps in VSCode:

1. Open the command palette by pressing Ctrl+Shift+P (Windows) or Cmd+Shift+P (Mac).
2. Type in "Flutter: New Project" and select the option from the dropdown menu.
3. Choose a project name and location for the new project.
4. Open the newly created project folder in VSCode.
5. Open the "launch.json" file by clicking on the debug icon in the left sidebar and selecting "Debug and Run" from the dropdown menu.
6. If the "Flutter" configuration is missing, click on the "Add Configuration" button and select "Flutter" from the list.
7. Save the changes to the "launch.json" file.

Once you have added the "Flutter" configuration to the "launch.json" file, you should be able to run Flutter applications again.