Error after install board3 1.05

[=CRU=Brandweer]

Your Portal Version: 1.0.0RC3
Your phpBB Type: Standard phpBB3
MODs installed: No
Your knowledge: Beginner
Boardlink: http://clanreunited.nl/forum/portal.php

What have you done before the problem was there?
I have installed a clean phpbb3 forum and then i have installed the board3 portal with the instructions. When i want to go to the portal or forum after the portal istallation i get a error 404.
When i remove the rule "DirectoryIndex portal.php index.php index.html index.htm" from the .htacces file then it will give a error 500.

What have you already tryed to solve the problem?
Already looked at the restrictions and acces rights, they are fine.

Description and Message
Can somebody help me please?

[Marc]

A 404 tells me that the file is not there, but I can also tell you what I saw on your board:
Not able to open ./cache/data_global.php

Check your .htaccess in you cache folder.

[=CRU=Brandweer]

I have checked it and now the forum works but i can't get the portal to work

[Marc]

It seems like you disabled the portal in the ACP.

[=CRU=Brandweer]

Do you know how to enable it? Thanks for your reply!

[Marc]

Open the ACP, click on the MODS-Tab and click on General Settings under the portal heading in the left sidebar. There you can enable it.

[=CRU=Brandweer]

When i do the edits in the files as the instructions say, then it goes wrong. My page doesn't work anymore after these edits.

I want to edit the following files but it doens't work for me, please help

.htaccess,
viewonline.php,
includes/constants.php,
includes/functions.php,
includes/session.php,
styles/prosilver/template/overall_header.html,
styles/prosilver/template/overall_footer.html,
styles/prosilver/theme/stylesheet.css

[=CRU=Brandweer]

Now nothing works anymore after re-edditing the files

It's making me scream

[=CRU=Brandweer]

I found the error in the constants.php Now everything works