Oracle error 6401

Dear All,
In my adapter configuration when i am configuring 4.2 the oracle intellegent adapter at test it shows me
[Adapter] (085) The adapter process could not be start up.
(300) Could not connect to oracle. see oracle product documentation for the error code : 6401.
where as i have modified the tnsnames.ora file to reflect the new sid and tnsping is connecting to that sid.

Can anyone please help me resolving this issue.

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