TNS error for HPSM

Hello all, 

i am using HPSM 9.4 on linux but am facing an issue with the DB connection , i keep getting the below error:

05/24/2016 09:04:56 RTE E Error: SQL code=12514 message=ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
866( 16980) 05/24/2016 09:04:56 RTE E API=OCIServerAttach-Remote [in sqociConnect]
866( 16980) 05/24/2016 09:04:56 RTE E Failure connecting to dbtype [oracle], using Oracle TNS 'ITSM', user 'SMADMIN'

 

any help please