DB Error: unknown error

Hello everybody i'm new in airtime i have a radio and i want use airtime for this, the problem is when i enter in localhost show me DB Error: unknown error, above paste the error.log of apache I use Ubuntu Natty, and i can't install phing

[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1056
[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1056
[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1056
[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1056
[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1057
[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1057
[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1057
[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1057
[Mon May 02 01:55:07 2011] [error] [client 127.0.0.1] PHP Notice: Uninitialized string offset: 0 in /var/lib/airtime/application/models/Shows.php on line 1057
[Mon May 02 01:55:10 2011] [error] [client 127.0.0.1] PHP Notice: Object of class DB_Error could not be converted to int in /var/lib/airtime/application/models/Preference.php on line 54
[Mon May 02 01:55:10 2011] [error] [client 127.0.0.1] PHP Notice: Object of class DB_Error could not be converted to int in /var/lib/airtime/application/models/Preference.php on line 54

I don't know where is the problem I need help....

TX and excusme for my bad english 'm from argentina and forgot write in english