user11972920 wrote:I would normally say "Welcome to the forum", but I see you've been a member for nearly 3 years. And just now making your very first post. To provide an answer to a question that was resolved nearly 4 months ago.
Please check the entry on ORATAB /etc/oratab . Please ensure that the right ORACLE_HOME is pointed in the /etc/oratab.
After changing the needful , please execute oraenv . Issue should be resolved.