ERROR: operator does not exist: timestamp without time zone + integer

Hi team,

We are getting an ERROR: "operator does not exist: timestamp without time zone + integer " while creating table in postgres. The same script is working fine in Oracle, I know there are some changes in postgres but I am unable to identify . Please suggest how we can create it successfully in postgres.

kbdb=# CREATE TABLE motif_site (
kbdb(# topic_match_conf_threshold bigint DEFAULT 3,
kbdb(# retention_period bigint DEFAULT 3,
kbdb(# site_mode_date timestamp NOT NULL DEFAULT date_trunc('day', LOCALTIMESTAMP)+7,
kbdb(# reload_submission_date timestamp,
kbdb(# socket_time_out bigint DEFAULT 2500,
kbdb(# reload_date timestamp,
kbdb(# marked_content_tag varchar(1024) DEFAULT 'pagecontent konabody intellitxt echotopic contentpaneopen postbody realtext newscontent content contentbody posttext##post_message_.*',
kbdb(# crawl_batch_size_lower_limit numeric(38) NOT NULL DEFAULT 20,
kbdb(# site_name varchar(512) NOT NULL,
kbdb(# crawl_batch_size_upper_limit numeric(38) NOT NULL DEFAULT 40,
kbdb(# mtg numeric(38) DEFAULT 2000,
kbdb(# enabled numeric(38) NOT NULL DEFAULT 0,
kbdb(# root_url varchar(1024),
kbdb(# blocked_content_tag varchar(1024) DEFAULT 'nointellitxt noechotopic',
kbdb(# match_params varchar(1024),
kbdb(# tf_data_source varchar(256) DEFAULT 'Web',
kbdb(# site_id numeric(38) NOT NULL
kbdb(# ) ;
ERROR: operator does not exist: timestamp without time zone + integer
HINT: No operator matches the given name and argument types. You might need to add explicit type casts.

Regards,
Daulat