Error when i use findpeaks

This 3 errors appear:

Error using findpeaks
Expected X to be strictly increasing.

Error in findpeaks>parse_inputs (line 241)
      validateattributes(Xin,{'numeric'},{'real','finite','vector','increasing'},'findpeaks','X');

Error in findpeaks (line 136)
  = parse_inputs(isInMATLAB,Yin,varargin{:});

My code is this:
Aceleracion=ACCVSM(:,1);
Tiempo=ts(:,1);
plot(ts,ACCVSM);
findpeaks(Tiempo,Aceleracion);

Thank you.

Answer 1

[dpb]

findpeaks(Aceleracion,Tiempo);

Unlike plot() and many other functions, since findpeaks can be called without a corollary time/frequency vector, the data vector is the first argument, the time/frequency vector second.

[Julen Aramendi]

Thanks!