Input timetables must contain unique row times when synchronizing using 'linear'

I tried to run this synchronous function but, its showing an error something like this

"Input timetables must contain unique row times when synchronizing using 'linear'

T = readtable('ctm.xlsx');

head(T);

T.Time = days(T.Time);

T.Time.Format = "hh:mm:ss.SSS";

TT = table2timetable(T,'RowTimes','Time');

head(TT);

D = readtable('DIC.xlsx');

D.Time = days(D.Time);

D.Time.Format = "hh:mm:ss.SSS";

DD = table2timetable(D,'RowTimes','Time');

data = synchronize(TT,DD,"secondly","linear");