ORA-ERRORS

I got ” ORA-01102: cannot mount database in exclusive mode ”  error in Oracle database.

I got ” ORA-00923: FROM keyword not found where expected ”  error in Oracle database.

I got ” ORA-22992: cannot use LOB locators selected from remote tables ”  error in Oracle database.

I got ” ORA-01732: data manipulation operation not legal on this view ”  error in Oracle database.

I got ” ORA-12705: Cannot access NLS data files or invalid environment specified”  error in Oracle database.

I got ” ORA-29278: SMTP transient error: string ”  error in Oracle database.

I got ” ORA-02391 Exceeded simultaneous session_per_user limit ”  error in Oracle database.

I got “ORA-04098: trigger is invalid and failed re-validation ”  error in Oracle database.

I got “ORA-39070: Unable to open the log file. ”  error in Oracle database.

I got ” ORA-01017: invalid username/password; logon denied ”  error in Oracle database.