After installation admin page will not open properly

[orphee]

This is my problem.. I install and can open the store front no problem, but the admin page brings up this error msg:

Fatal error: Cannot instantiate non-existent class: messagestack in /home/etc/etc/etc/store/includes/autoload_func.php on line 79

help?

[superprg]

You probably havent copied all the required files
admin\includes\classes\message_stack.php