Not able to get base url

[eluser]Bees[/eluser]
can u pls tell me why i am geeting error while loading base url eventhough i have called url in auto load and library url in the controller function. Pls help me

[eluser]Aken[/eluser]
Post your code and the error; we can't help you by guessing what error you're getting.

[eluser]Bees[/eluser]
this is the error i am getting "A PHP Error was encountered

Severity: Notice

Message: Undefined variable: base_url

Filename: views/login.php

Line Number: 23"

[eluser]Bees[/eluser]
Pls can anyone help me get out of this error.....

[eluser]Bees[/eluser]
It was my mistake , thanks for your support.