Major error when upgrading!

[retrovogue]

I recently tried to upgrade my photo gallery from 1.3.4 to 1.4.8 in my Fantastico from my cPanel.

When doing so, I encountered a really weird error and I'm not too sure what it means or what to do, Fantastico gave me this message:
"Upgrading...

Initializing Parameters - Done.

Upgrade failed

The database is not working properly and the creation of a database backup file has failed. Please contact the sysadmin for further assistance. Include this message for reference.

The initial installation has not been modified."

And when I go to the main page, I get this error code:
Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 230

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 231

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 232

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 233

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 234

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 235

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 236

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 237

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 238

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 239

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 240

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 241

Notice: Undefined index: TABLE_PREFIX in /home/twilson/public_html/photos/include/init.inc.php on line 242
Coppermine critical error:
Unable to connect to database !

MySQL said: Access denied for user 'nobody'@'localhost' (using password: NO)

Can anyone please help on how I can fix the issue?

[Nibbler]

Contact your host as the message suggests. We don't support fantastico for this very reason - it causes problems.

[Tranz]

Alternatively, you should download the file from our site and read the instructions on doing the manual upgrade.