'MinPeakDistance' Error in findpeaks Function

[William Popov]

Hello,
I'm currently working with the findpeaks function to process some data from a pressure sensor. I am encountering an error to which I can't seem to find a solution. My input is as follows:

[pks,locs,w,p]=findpeaks(z,50,'MinPeakProminence',min_peak_prominence,'MinPeakDistance',2.71);
Where z and 'min_peak_prominence are the dataset and a previously assigned value greater than 2.7, respectively.

The 'MinPeakDistance' name-value argument is giving me the following error:

Error using findpeaks
Expected MinPeakDistance to be a scalar with value < 2.7.

Error in findpeaks>parse_inputs (line 318)
validateattributes(Pd,{'numeric'},{'real','scalar','nonempty','nonnegative','<',x(M)-x(1)},'findpeaks','MinPeakDistance');

Error in findpeaks (line 131)
[y,yIsRow,x,xIsRow,minH,minP,minW,maxW,minD,minT,maxN,sortDir,annotate,refW] ...

Error in lunge_splitter (line 59)
[pks,locs,w,p]=findpeaks(z,50,'MinPeakProminence',min_peak_prominence,'MinPeakDistance',2.71);

I don't understand why it expects the MinPeakDistance value to be <2.7, and this is causing some headaches in regards to processing the data. Could anyone shed some light on this?

Thanks.

P.S. I'm relatively inexperienced with MATLAB, so I apologize in advance if I'm missing something obvious.