Oracle Database Discussions

I work on an oracle db 11.2.0.4.0

I try to read number record of a schema.There are about 3.000 tables on this schema. I read that the classical statement

num_rows column in dba_tables  is true for the data time of the last analyze. So I try script as :

select

    table_name,

    to_number(

      extractvalue(

        xmltype(

dbms_xmlgen.getxml('select count(*) c from '||table_name))

        ,'/ROWSET/ROW/C')) count

  from user_tables;

show the list  of table but when I try do go to the bottom this messagge popup:

ORA-19202: Error during elaboration XML

ORA-00942: table or view not exists

ORA-06512: a "SYS.DBMS_XMLGEN", line 176

ORA-06512: at line 1

I am not understand what is happen .

There are other way to do a report with the number of the records ?

Thanks in adavantage to anyone wants to answer.

Dan