Report Printing Does not work on Apex 3.0.1

Question

Hi Everyone,
I have a report on apex page,i just set "Print Attributes" to Yes and format to PDF.
But when i got the pdf output and try to open with adobe reader ,a message comes on like:
"Adobe reader coudl not open 'xxx.pdf' because it is not either supported file type or because the file has been damaged ..."
Then i set the format to word ,then the output is an empty page ?
What should i do?
Here is the query:
select initcap(u.name),upper(u.surname),g.email,c.city_name,y.year,sec.job_tname,jt.type_name,ps.ps_name,sf.s_name from grad_info g,users u,city c,years y,sector_type sec,job_type jt,positions ps,sfact_degree sf
WHERE
     CASE WHEN TO_NUMBER(:P16_NAME) = -1 THEN u.USER_ID
     ELSE TO_NUMBER(:P16_NAME)
     END = u.USER_ID
AND
     CASE WHEN TO_NUMBER(:P16_GENDER)=-1 THEN g.GENDER
     ELSE TO_NUMBER(:P16_GENDER)
     END=g.GENDER
AND
     CASE WHEN TO_NUMBER(:P16_GRADYEAR)=-1 THEN g.GRAD_YEAR
     ELSE TO_NUMBER(:P16_GRADYEAR)
     END=g.GRAD_YEAR
AND
     CASE WHEN TO_NUMBER(:P16_CITY)=-1 THEN g.CITY
     ELSE TO_NUMBER(:P16_CITY)
     END=g.CITY
AND
     CASE WHEN TO_NUMBER(:P16_SECTOR)=-1 THEN g.SECTOR
     ELSE TO_NUMBER(:P16_SECTOR)
     END=g.SECTOR
AND
     CASE WHEN TO_NUMBER(:P16_JOBTYPE)=-1 THEN g.JOB_TYPE
     ELSE TO_NUMBER(:P16_JOBTYPE)
     END=g.JOB_TYPE
AND
     CASE WHEN TO_NUMBER(:P16_SATISTACT)=-1 THEN g.SATISFACT
     ELSE TO_NUMBER(:P16_SATISTACT)
     END=g.SATISFACT
AND
     CASE WHEN TO_NUMBER(:P16_POSITION)=-1 THEN g.POSITION
     ELSE TO_NUMBER(:P16_POSITION)
     END=g.POSITION
AND
     CASE WHEN TO_NUMBER(:P16_LOKNG4JOB)=-1 THEN g.LOKNG_4_JOB
     ELSE TO_NUMBER(:P16_LOKNG4JOB)
     END=g.LOKNG_4_JOB
AND
----------------Join Starts Here------------------------------
g.sector=sec.job_id and g.job_type=jt.type_id and
g.user_id=u.user_id and g.grad_year=y.year_id and g.current_flag=1 and g.city=c.city_id
and ps.ps_id=g.position and g.satisfact=sf.s_id
*************************************************************

Answer 1

Try asking this question in the APEX forum, this forum is for Oracle Portal questions.