php - Non-existent class: Template - Upgrade to Code Igniter 3.0.0 -

i upgrading codeigniter 2.2.0 3.0.0

it said

404 page not found oops, page you're looking not found or unavailable. error encountered

non-existent class: template

error - 2015-03-31 23:02:10 --> non-existent class: template error - 2015-03-31 23:02:31 --> non-existent class: template 

i checked on loader.php there's no template.php

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an error encountered

cannot write 'title' region. region undefined.

try changing class name template instead of ci_template. make sure change constructor of class.