Upgrade CI 2x to 3x?

I have just updated my project CI 2 to CI 3[dev]. In order to do that i just replaced the 'system' folder and 'index.php' file to CI 3.

Now i am getting error, not sure what to do.. here is all the errors:

PHP Code:

( ! ) Warning: include(E:\Installed Softwares\wamp\www\pro.dev\public\application\views\errors\html\error_php.php): failed to open stream: No such file or directory in E:\Installed Softwares\wamp\www\pro.dev\public\system\core\Exceptions.php on line 269
Call Stack
#    Time    Memory    Function    Location
1    0.0020    270672    {main}( )    ..\index.php:0
2    0.0050    341168    require_once( 'E:\Installed Softwares\wamp\www\pro.dev\public\system\core\CodeIgniter.php' )    ..\index.php:292
3    0.0740    1297616    show_404( )    ..\CodeIgniter.php:453
4    0.0760    1336440    CI_Exceptions->show_404( )    ..\Common.php:449
5    0.0760    1336896    CI_Exceptions->show_error( )    ..\Exceptions.php:138
6    0.0770    1356512    _error_handler( )    ..\Exceptions.php:182
7    0.0770    1356832    CI_Exceptions->show_php_error( )    ..\Common.php:620

( ! ) Warning: include(): Failed opening 'E:\Installed Softwares\wamp\www\pro.dev\public\application\views\errors\html\error_php.php' for inclusion (include_path='.;C:\php\pear') in E:\Installed Softwares\wamp\www\pro.dev\public\system\core\Exceptions.php on line 269
Call Stack
#    Time    Memory    Function    Location
1    0.0020    270672    {main}( )    ..\index.php:0
2    0.0050    341168    require_once( 'E:\Installed Softwares\wamp\www\pro.dev\public\system\core\CodeIgniter.php' )    ..\index.php:292
3    0.0740    1297616    show_404( )    ..\CodeIgniter.php:453
4    0.0760    1336440    CI_Exceptions->show_404( )    ..\Common.php:449
5    0.0760    1336896    CI_Exceptions->show_error( )    ..\Exceptions.php:138
6    0.0770    1356512    _error_handler( )    ..\Exceptions.php:182
7    0.0770    1356832    CI_Exceptions->show_php_error( )    ..\Common.php:620

( ! ) Warning: include(E:\Installed Softwares\wamp\www\pro.dev\public\application\views\errors\html\error_php.php): failed to open stream: No such file or directory in E:\Installed Softwares\wamp\www\pro.dev\public\system\core\Exceptions.php on line 269
Call Stack
#    Time    Memory    Function    Location
1    0.0020    270672    {main}( )    ..\index.php:0
2    0.0050    341168    require_once( 'E:\Installed Softwares\wamp\www\pro.dev\public\system\core\CodeIgniter.php' )    ..\index.php:292
3    0.0740    1297616    show_404( )    ..\CodeIgniter.php:453
4    0.0760    1336440    CI_Exceptions->show_404( )    ..\Common.php:449
5    0.0760    1336896    CI_Exceptions->show_error( )    ..\Exceptions.php:138
6    0.1420    1357024    _error_handler( )    ..\Exceptions.php:182
7    0.1420    1357120    CI_Exceptions->show_php_error( )    ..\Common.php:620

( ! ) Warning: include(): Failed opening 'E:\Installed Softwares\wamp\www\pro.dev\public\application\views\errors\html\error_php.php' for inclusion (include_path='.;C:\php\pear') in E:\Installed Softwares\wamp\www\pro.dev\public\system\core\Exceptions.php on line 269
Call Stack
#    Time    Memory    Function    Location
1    0.0020    270672    {main}( )    ..\index.php:0
2    0.0050    341168    require_once( 'E:\Installed Softwares\wamp\www\pro.dev\public\system\core\CodeIgniter.php' )    ..\index.php:292
3    0.0740    1297616    show_404( )    ..\CodeIgniter.php:453
4    0.0760    1336440    CI_Exceptions->show_404( )    ..\Common.php:449
5    0.0760    1336896    CI_Exceptions->show_error( )    ..\Exceptions.php:138
6    0.1420    1357024    _error_handler( )    ..\Exceptions.php:182
7    0.1420    1357120    CI_Exceptions->show_php_error( )    ..\Common.php:620 


The CI3 has views for errors. They are located inside application/views/errors directory

Website: http://avenir.ro

Also, it would be nice if you follow the update instructions located at: http://www.codeigniter.com/userguide3/in...e_300.html

Website: http://avenir.ro