Duplication error . please help.

Dear group,

Looking forward to get some help form experiences
members.

BEGIN TRANSACTION;
INSERT INTO
EXPERIMENT(study_id,genechip_id,sample_id,mat_id,hyb_id,exp_aim)VALUES((SELECT
study_id from study where study_author = 'Georgantas
RW 3rd and Civin CI'),(SELECT genechip_id from
genechip where genechip_array = 'U133B'),(SELECT
sample_id FROM sample WHERE sample_name ='Human stem
cells'),(SELECT mat_id FROM material_manip where
mat_treatment_type = 'ES H1-1a'),(select hyb_id from
experiment where exp_id =
(currval('experiment_exp_id_seq'))),'In this
experiment ES H1-1a sample was used test on U133B chip
');
INSERT INTO
PLATFORM(platform_filename,platform_file_loc,exp_id)VALUES('RGeo-ESHSC-H1ES-1a-U133B','\/home\/database\/bob\/data\/es\/RGeo-ESHSC-H1ES-1a-U133\/RGeo-ESHSC-H1ES-1a-U133B',(currval('experiment_exp_id_seq')));

INSERT INTO
CEL(exp_id,platform_id,affy_x,affy_y,affy_mean,affy_stdv,affy_npixels)VALUES((currval('experiment_exp_id_seq')),(SELECT
platform_id from platform where platform_filename =
'RGeo-ESHSC-H1ES-1a-U133B'),0,0,125.0,18.8,25);

INSERT INTO
CEL(exp_id,platform_id,affy_x,affy_y,affy_mean,affy_stdv,affy_npixels)VALUES((currval('experiment_exp_id_seq')),(SELECT
platform_id from platform where platform_filename =
'RGeo-ESHSC-H1ES-1a-U133B'),1,0,7702.0,1603.0,25);

INSERT INTO
CEL(exp_id,platform_id,affy_x,affy_y,affy_mean,affy_stdv,affy_npixels)VALUES((currval('experiment_exp_id_seq')),(SELECT
platform_id from platform where platform_filename =
'RGeo-ESHSC-H1ES-1a-U133B'),2,0,121.0,23.4,30);

INSERT INTO
CEL(exp_id,platform_id,affy_x,affy_y,affy_mean,affy_stdv,affy_npixels)VALUES((currval('experiment_exp_id_seq')),(SELECT
platform_id from platform where platform_filename =
'RGeo-ESHSC-H1ES-1a-U133B'),3,0,8156.0,1584.3,25);

I get the following error, when I execute.
BEGIN
INSERT 132600251 1
INSERT 132600252 1
psql:/home/database/bob/dbsqls/torun/ESHSC-H1ES/test.sql:6:
ERROR: more than one row returned by a subquery used
as an expression
psql:/home/database/bob/dbsqls/torun/ESHSC-H1ES/test.sql:8:
ERROR: current transaction is aborted, commands
ignored until end of transaction block
psql:/home/database/bob/dbsqls/torun/ESHSC-H1ES/test.sql:10:
ERROR: current transaction is aborted, commands
ignored until end of transaction block
psql:/home/database/bob/dbsqls/torun/ESHSC-H1ES/test.sql:12:
ERROR: current transaction is aborted, commands
ignored until end of transaction block

when I removed the :
INSERT INTO
PLATFORM(platform_filename,platform_file_loc,exp_id)VALUES('RGeo-ESHSC-H1ES-1a-U133B','\/home\/database\/bob\/data\/es\/RGeo-ESHSC-H1ES-1a-U133\/RGeo-ESHSC-H1ES-1a-U133B',(currval('experiment_exp_id_seq')));

This is the result:
BEGIN
INSERT 132600246 1
INSERT 132600247 1
INSERT 132600248 1
INSERT 132600249 1
INSERT 132600250 1

Clean result.

when I uncommented insert into cel statements, the
result is this:

BEGIN
INSERT 132600244 1
INSERT 132600245 1
bob=> rollback;
ROLLBACK

Clean.

when I execture every statement I get the foollowing
error:
ERROR: more than one row returned by a subquery
ed as an expression

Can any one help suggesting a way to deal this
problem.

thank you.

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