Simple Form Post Not Working

Isn't it "public function __construct()" (with two underscores)?

Also, why use "session_start()" (native php function), and then use "$this->session->userdata" (CodeIgniter specific method)? Why not load the session library and then remain using the library all the way around?

...Also, related to the "$this->web_app_model->getLoginData($u, $p);" error. Did you load the model before using it?

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