VB 5.05 install error Could not open backend config file

[pcg]

I uploaded files to new vb5 empty folder
I modified the core/includes config file
I verified the config.php file in the root (vb5 folder)
When running the install I enter my ID
I get a configuration screen Vbulletin 5 configuration builder and fill out my info correctly. Above the "cookie prefix" I get in red "Warning backend already exists"
After filling in the correct info for the configuration screen, I get the following page error error when I hit Create Files button

Warning: file_get_contents() [function.file-get-contents]: Filename cannot be empty in /home/eastval2/public_html/forums/vb5/core/install/makeconfig.php on line 236
Error - Could not open backend config file.

On line 236 of the makeconfig.php, line 236 looks like this
$configContent = file_get_contents($componentInfo['source']);
When looking for the "source" I see on line 206, if says 'source' => realpath(implode(DIRECTORY_SEPARATOR, array($basePath, 'config.php.bkp'))),
I do see in the root (vb5) the config.php.bkp.

Questions:
1. Why am I getting the Backend exists error
2. What does the Page error mean?

[IggyP]

not sure how relevant...but to make sure you know you need have a renamed config files to only config.php

taking off the extra extension, such as .bkp

[pcg]

Thanks. Same.