I was stuck during installation vb 5.2.0

[TeckTP]

I have a problem, I have an old license for VB4 and works the Forum for the domain ex: http://www.example.com, I created each domain ex http://beta.example.com and I wanted to install VB5, (I have a license)
but during installation there is a problem:
Fatal Error Occurred
Error on /home/betaforum/public_html/core/vb/library/style.php: 548

Script: 520a3
Step 5
What am I doing wrong? I get tired a few hours.