HTML Chart in APEX error out

Question

Hi All,
I have to create the HTML Chart but while using the below query I am getting following error. Please advise.
Certain queries can only be executed when running your application, if your query appears syntactically correct, you can save your query without validation (see options below query source).
{select NULL LINK,
c.first_name "Requesting Site" LABEL,
   sum(case when round(st.close_dt - st.open_dt) < 16              then 1 else 0 end) "< 15", 
   sum(case when round(st.close_dt - st.open_dt) between 16 and 31 then 1 else 0 end) "< 30",
   sum(case when round(st.close_dt - st.open_dt) between 32 and 46 then 1 else 0 end) "< 45",
   sum(case when round(st.close_dt - st.open_dt) between 47 and 61 then 1 else 0 end) "< 60",
   sum(case when round(st.close_dt - st.open_dt) > 61 then 1 else 0 end) "60+"
from stat.csr_master_tbl m,
     stat.customers c,
     stat.proj_csrs p,
     stat.appl_type ap,
    stat.csr_type_cd tp,
     stat.csr_status st,
     stat.csr_status_cd sc,
     stat.wrkflw_defn w
where m.cust_id = c.cust_id
and m.csr_id  = p.csr_id (+)
and m.sd_cd  = p.sd_cd (+)
and m.appl_cd = ap.appl_cd
and m.sd_cd = ap.sd_cd
and m.sd_cd = tp.sd_cd
and m.csr_type = tp.csr_type_cd
and m.sd_cd = st.sd_cd
and m.csr_id = st.csr_id
and st.csr_status_cd = sc.csr_status_cd
and st.sd_cd = sc.sd_cd
and tp.csr_type_cd = sc.csr_type_cd
and m.wrkflw_id = w.wrkflw_id
and (m.sd_cd in ('11i','AVA') or (m.sd_cd in ('STR') ))
and (    st.close_dt between to_date(:beg_date,'MM/DD/YYYY') and to_date(:end_date,'MM/DD/YYYY')
       or st.closed_status_flag <> 'Y')
AND sc.descr  IN ('Close')
and c.first_name in ('Springville'
,'Cookeville'
,'Bangalore'
,'Deer Park'
,'Sulphur Springs'
,'P11i'
,'Singapore'
,'Bangalore Chemical'
,'Baton Rouge'
,'Kaohsiung'
,'Bangalore Controls'
,'Damam'
,'Dayton Foundry'
,'Edmonton'
,'Jebel Ali'
,'Melbourne'
,'Philadelphia'
,'Tangerang'
,'Freeport'
,'Corpus Christi'
,'Kunatan')
group by c.first_name
}

Answer 1

even I have done this but it is not working
{select null Link,
c.first_name label,
   sum(case when round(st.close_dt - st.open_dt) < 16              then 1 else 0 end) "< 15", 
   sum(case when round(st.close_dt - st.open_dt) between 16 and 31 then 1 else 0 end) "< 30",
   sum(case when round(st.close_dt - st.open_dt) between 32 and 46 then 1 else 0 end) "< 45",
   sum(case when round(st.close_dt - st.open_dt) between 47 and 61 then 1 else 0 end) "< 60",
   sum(case when round(st.close_dt - st.open_dt) > 61 then 1 else 0 end) "60+"
from stat.csr_master_tbl m,
     stat.customers c,
     stat.proj_csrs p,
     stat.appl_type ap,
    stat.csr_type_cd tp,
     stat.csr_status st,
     stat.csr_status_cd sc,
     stat.wrkflw_defn w
where m.cust_id = c.cust_id
and m.csr_id  = p.csr_id (+)
and m.sd_cd  = p.sd_cd (+)
and m.appl_cd = ap.appl_cd
and m.sd_cd = ap.sd_cd
and m.sd_cd = tp.sd_cd
and m.csr_type = tp.csr_type_cd
and m.sd_cd = st.sd_cd
and m.csr_id = st.csr_id
and st.csr_status_cd = sc.csr_status_cd
and st.sd_cd = sc.sd_cd
and tp.csr_type_cd = sc.csr_type_cd
and m.wrkflw_id = w.wrkflw_id
and (m.sd_cd in ('11i','AVA') or (m.sd_cd in ('STR') ))
and (    st.close_dt between to_date(:beg_date,'MM/DD/YYYY') and to_date(:end_date,'MM/DD/YYYY')
       or st.closed_status_flag <> 'Y')
AND sc.descr  IN ('Close')
and c.first_name in ('Springville'
,'Cookeville'
,'Bangalore'
,'Deer Park'
,'Sulphur Springs'
,'P11i'
,'Singapore'
,'Bangalore Chemical'
,'Baton Rouge'
,'Kaohsiung'
,'Bangalore Controls'
,'Damam'
,'Dayton Foundry'
,'Edmonton'
,'Jebel Ali'
,'Melbourne'
,'Philadelphia'
,'Tangerang'
,'Freeport'
,'Corpus Christi'
,'Kunatan')
group by c.first_name
}