Help in building a subquery

Consider the following query which works correctly

        select      top 1
                    s.timein
                   ,diff_seconds = min(abs(datediff(s,convert(datetime,'1969/06/19' +
                                           ' ' + '19:52:25'),convert(datetime,'1969/06/19' + ' ' + s.timein))))
                  from      employee e
                  join      emp_schedule es        on (es.dept_code = e.section_code and es.company_code = e.company_code)
                  join      emp_schedule_det esd on (es.trans_no = esd.trans_no    and es.company_code = esd.company_code and esd.card_code = e.card_code)
                  join      schedules s              on (s.schedule_code = es.schedule_code)
                  where ( e.card_code = '2553')
                  group by e.card_code
                  , s.timein
                  , s.timeout
                  order by 2

Result

timein      diff_seconds
20:00:00      455

In the above query '19:52:25' is constant.  This (the different times) has to come from a table say temp_2553

For that I am trying

select
t.timein
              ,(select x.timein
                    from
                    (
                    select      top 1
                    s.timein
                   ,diff_seconds = min(abs(datediff(s,convert(datetime,'1969/06/19' +
                                           ' ' + t.timein),convert(datetime,'1969/06/19' + ' ' + s.timein))))
                  from      employee e
                  join      emp_schedule es        on (es.dept_code = e.section_code and es.company_code = e.company_code)
                  join      emp_schedule_det esd on (es.trans_no = esd.trans_no    and es.company_code = esd.company_code and esd.card_code = e.card_code)
                  join      schedules s              on (s.schedule_code = es.schedule_code)
                  where ( e.card_code = '2553')
                  group by e.card_code
                  , s.timein
                  , s.timeout
                  order by 2
                  )x
                  )
from temp_2553 t

There is this error.
Multiple columns are specified in an aggregated expression containing an
outer reference. If an expression being aggregated contains an outer reference,
then that outer reference must be the only column referenced in the expression.

What is the problem.

I would further elaborate what the query is doing in comment area.