Fatal error - help

Please I need your assistance in installing (dolphin) package on my server. I followed the installation instruction, but got the following error message when I try to access (install/index.php). My server support ask me to refer to you, here is the error message:

****Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@cityearth.org and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.
Apache/2.2.9 (Unix) mod_ssl/2.2.9 OpenSSL/0.9.8g DAV/2 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 Server at cityearth.org Port 80***

I look forward to hearing from you,

Thank you for your help.

Je vous aime tous!
I love you all!

Try to replace
return genUniqueValue( $sFieldName, $sValue, true );
to
return $this->genUniqueValue( $sFieldName, $sValue, true );