end-of-file on communication channel

I use oracle Release 9.0.1.0.1
and i have a view like this:

create or replace view test as
(
select
requests.rqs_no ,
requests.address ,
requests.area_cd ,
unwanted_off.reason,
unwanted_off.status,
case
when unwanted_off.rqs_no is null then 0
when (status in(5,6) ) then 1
when (status =4 and ref_rqs_no in (select rqs_no from unwanted_off where status=6 )) then 1
when (status =3 and ref_rqs_no in (select rqs_no from wanted_off)) then 1
else 0
end chk
FROM
groups,
req_rsn_opr,
reasons,
requests,
unwanted_off
where
requests.off_type=1
and requests.grp_code=groups.groups_code(+)
and requests.main_rsn_opr=req_rsn_opr.rsn_opr_code(+)
and requests.rqs_no=unwanted_off.rqs_no(+)
and unwanted_off.main_reason=reasons.reason_code(+)
);


now :
sql> select rqs_no from test where area_cd=1 and chk=:Parameter;
it works fine but:
sql> select rqs_no,chk from test where area_cd=1 and chk=arameter ;
it show me this error:
ERROR at line 1:
ORA-03113: end-of-file on communication channel

i have to send a parameter for chk because i use formbuilder.
i want to know what is wrong with this view.

best regards.

This has nothing to do with your SQL.

There is some type of TWO_TASK failure (SQLNet).
Get your DBA to look for a trace