Datapump error in log file When I do this:

DECLARE
hdnl NUMBER;
BEGIN
hdnl := DBMS_DATAPUMP.open( operation =&gt; 'EXPORT', job_mode =&gt; 'TABLE', job_name=&gt;null);
DBMS_DATAPUMP.ADD_FILE( handle =&gt; hdnl, filename =&gt; 'tab1.dmp', directory =&gt; 'DATA_PUMP_DIR', filetype =&gt; dbms_datapump.ku$_file_type_dump_file);
DBMS_DATAPUMP.add_file( handle =&gt; hdnl, filename =&gt; 'exp.log', directory =&gt; 'DATA_PUMP_DIR', filetype =&gt; dbms_datapump.ku$_file_type_log_file);
DBMS_DATAPUMP.METADATA_FILTER(hdnl,'SCHEMA_EXPR','IN (''USERS'')');
DBMS_DATAPUMP.METADATA_FILTER(handle =&gt; hdnl,name =&gt; 'NAME_EXPR',value =&gt; 'IN (''CA_FILE'')');
DBMS_DATAPUMP.start_job(hdnl);
END;
/


And I read: 

select * from table(RDSADMIN.RDS_FILE_UTIL.READ_TEXT_FILE('DATA_PUMP_DIR','tab1.dmp')); 


It gives me following:

Starting "AUSER"."SYS_EXPORT_TABLE_01":  
Estimate in progress using BLOCKS method...
Total estimation using BLOCKS method: 0 KB
ORA-31655: no data or metadata objects selected for job
Job "AGSUSER"."SYS_EXPORT_TABLE_01" completed with 1 error(s) at Tue Jan 26 20:28:37 2016 elapsed 0 00:00:01


I am trying to EXPORT 1 table. What's wrong?
This simply means you do not have any table called USERS.CA_FILE.