ociplogon() [function.ociplogon]: ORA-12514 error in php+adodb with oracle connection

[thread_PHP]

Hi All
I am getting this error while running an application oracle(10.1.g) connection using adodb with php (5.3) on xampp

I am getting following error

can anybody help me to solve this problem

ociplogon() [function.ociplogon]: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor in c:...\adodb\drivers\adodb-oci8.inc.php on line 215