User Authentication Using Servlet in Java

Question

 

am new in jsp and netbeans. Now am wrote the code for 'User Authentication Using Servlet in Java' program . after that am run the project, the fowwling error appeared:

 

 

Deployment error:

Access to Tomcat server has not been authorized. Set the correct username and password with the "manager" role in the Tomcat customizer in the Server Manager.

See the server log for details.

 

how can i solve this error.