Service OracleSOL102iSQL*Plus not starting

Dears,

Recently we have upgraded Oracle 9i to 10.2.0.1.

Everything is working fine but service OracleSOL102iSQL*Plus created at upgrade is not getting start.

and in error it is only showing that service is not starting in a timely fashion.

Please suggest what could be the possible reason of this issue.

Shivam