Oracle Solution for Error ora-16006

ORA-16006: audit_trail destination incompatible with database open mode

What triggered the Error:

The audit_trail initialization parameter was set to "DB" (or TRUE), which is incompatible with a database opened for read-only access.

What should we do to fix it:

When the database is opened for read-only access, the audit_trail initialization parameter can only be set to "OS" or "NONE" (FALSE).