Can't open the mysql.plugin table. Please run mysql_upgrade to create it.

As an AI language model, I cannot run commands on your system. However, in general, the error message means that the mysql.plugin table is missing or corrupted. To fix this, you need to run the mysql_upgrade command in your MySQL server. This command updates the system tables to the latest version and creates the missing tables. Here are the steps to run mysql_upgrade:

1. Make sure the MySQL server is running.
2. Open a command prompt or terminal window.
3. Type the following command and press Enter:
mysql_upgrade

4. Wait for the command to complete. It may take a few minutes.
5. Restart the MySQL server if necessary.

After running mysql_upgrade, try to open the mysql.plugin table again. The error message should be resolved.