Having an error : matrix dimension must agree

Hi! I need your help. I have a problem with the code below. It says an error: "matrix dimension must agree'. Do you know how to solv this problem? Thank you very much for your help.

% convert the datetime to double
time_start=datenum(peakflowanalysis2.Start);
time_end=datenum(peakflowanalysis2.End);
time_array=datenum(flowtable.DateAndTime);
flow=flowtable.Durchflusslm;

ind1=find(time_array==time_start);
ind2=find(time_array==time_end);
peak_sum=trapz(flow(peakflowanalysis2.Start(ind1):peakflowanalysis2.End(ind2)));% trapz method

I got an error in find function. Is that because I use double format for time_start, time_end and time_array? Thank you so much for your help.

[Birdman]

What are the sizes of time_start, time_end and time_array?

[Kasih Ditaningtyas Sari Pratiwi]

time_start is 11x1 double, time_end 11x1 double, and time_array 5527x1 double. I want to know the index of the time so that I can use it for trapz function