Toad Version Problem

I use Oracle 11.2. version and have been using Toad 12.6.0.53 version.

Oracle Version:

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production

PL/SQL Release 11.2.0.3.0 - Production

CORE        11.2.0.3.0        Production

TNS for IBM/AIX RISC System/6000: Version 11.2.0.3.0 - Production

NLSRTL Version 11.2.0.3.0 - Production

Recently when I tried to export the DDL of a particular table from this menu:

Toad => Database => Export => Generate Schema script:

I got this error:

I tried to see how this error occurs: so I spooled sql into the screen and got this output:

Select table_name, column_name, data_type, data_type_mod, data_type_owner,

       decode(data_type, 'CHAR', char_length,

                         'VARCHAR', char_length,

                         'VARCHAR2', char_length,

                         'NCHAR', char_length,

                         'NVARCHAR', char_length,

                         'NVARCHAR2', char_length,

                         data_length) data_length,

       data_precision, data_scale, nullable, char_used

       , virtual_column

       , identity_column, column_id, hidden_column, default_on_null

FROM SYS.DBA_TAB_COLS c

WHERE OWNER = :own

AND   USER_GENERATED = 'YES'

and exists (select 'x'

            from  sys.DBA_ALL_TABLES t

            where t.table_name = c.table_name

            and   t.owner = c.owner)

order by table_name, internal_column_id

I tried looking information about the column 'USER_GENERATED' in the table DBA_TAB_COLS in the Oracle Documentation and got the below information:

This column is a Oracle 12c column and my Toad tried to look for this column as I use the wrong version of Toad.

Resolution: Toad and Oracle versions are incompatible. So Installed Toad 11.6 version. This will resolve the version discrepancy issue.