ERROR for '@' for function

How to handle this below situation, I am getting error for function, my
Postgres version is 9.4
is

ERROR: syntax error at or near "@"
LINE 67: AUTONUMBERSETTING(at)REPOS(dot)BIRCHSTREET(dot)NET
^
********** Error **********
ERROR: syntax error at or near "@"
SQL state: 42601
Character: 3274

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BEGIN
select NEXT_NUMBER into STRICT id from
AUTONUMBERSETTING(at)REPOS(dot)BIRCHSTREET(dot)NET
--pbeach_repos8.AUTONUMBERSETTING
where subscriber_id=subscriber and AUTO_NUMBER_ID=348 and company_id=
buyer;
exception
when no_data_found then
insert into
smerror_log(error_log_id,subscriber_id,company_id,error_message,system_message,
method_name,creation_date,creation_user,update_date,update_user)
values (nextval('smerror_log_sequence'),subscriber,buyer,'Auto Number
not found',null,
'PunchoutProfile' ,LOCALTIMESTAMP,'Admin',LOCALTIMESTAMP,'Admin');
commit;
return;
end;

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