Not able to login in web api with authentication

Hi all people.

 

i have been working on a sample logine page and i am able to register the user in the registeration page , but after going to logine page with the same username and password which wa was just created it it showing errors..Please help me in this  i dont know what i am doing wrong.i am also getting error in my angular app when i am trying to login into the application.

 for the reference i am adding the code. any help will be appreciated. 

thanks in advance  .