Why won't my mail app work on my iphone?

I'm trying to put my gmail on my iphone and it says the username or password is incorrect even though i can log on to it from the conputer

Enter the following settings:
Under Incoming Mail Server
Host Name: imap.gmail.com
Username: Use your full Gmail address, like test@gmail.com
Password should be automatically filled in from the previous page
Outgoing Mail Server
Host Name: smtp.gmail.com
Username: Use your full Gmail address, like test@gmail.com
Password: Your Gmail password

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