After Admin user Login (Blank Page)

hi,
   i'm new to PHP and phpgroupware,
1. I install PHP and Configure with Apache Server
2. I deploy phpgroupware in Apache server
3. Create header.inc.php file 
4. Create Database 
5. Login in Setup/Config Admin Login
6. Step 1: Install Application
   Step 2:Create Admin User and Demo User
   All the 4 steps completed i logout it,
i try to login in phpgroupware, give user and password in login page and click ok, After i got a blank screen only, 

 i missed any other configuration, i need some help ..

Thank 
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