code no longer working

hi all my code was working last night fully but no longer working when trying to get it to run today i ahve changed nothing today and the error is due to the filtfilt function.

i have checked multiple times but it is not working

any ideas

below is the bit of code casuing the issue and the error

    Error in group_04 (line 197)
    Sjforce_filtered=filtfilt(b,a,SjForce);

%usign butterworth to filta the data
%selecting the cut of frequency
%cut of frequency will be the smame for both
Force_cutfreq=7;
%setting the code for both standard and squat jump
[b,a]=butter(2,Force_cutfreq/(Freq1/2),'low');
%for the standard jump jump
Sjforce_filtered=filtfilt(b,a,SjForce);
%for the squat jump
Sqforce_filtered=filtfilt(b,a,SqForce);

[Torsten]

Check your license for the Signal Processing Toolbox.

[James Webber]

how??

and i have a code very similar and it works fine using the same commands

[Torsten]

If you can use "filtfilt" in the other code, it can't be a licence problem.

Then check your inputs b, a and SjForce if they fulfill the documented requirements:

b, a — Transfer function coefficients

vectors

Transfer function coefficients, specified as vectors. If you use an all-pole filter, enter 1 for b. If you use an all-zero (FIR) filter, enter 1 for a.

Example: b = [1 3 3 1]/6 and a = [3 0 1 0]/3 specify a third-order Butterworth filter with a normalized 3-dB frequency of 0.5π rad/sample.

Data Types: single | double

x — Input signal

vector | matrix | N-D array

Input signal, specified as a real-valued or complex-valued vector, matrix, or N-D array. x must be finite-valued. The length of x must be greater than three times the filter order, defined as max(length(B)-1, length(A)-1). The function operates along the first array dimension of x unless x is a row vector. If x is a row vector, then the function operates along the second dimension.

Example: cos(pi/4*(0:159))+randn(1,160) is a single-channel row-vector signal.

Example: cos(pi./[4;2]*(0:159))'+randn(160,2) is a two-channel signal.

Data Types: single | double

Complex Number Support: Yes

[Image Analyst]

% Check that user has the specified Toolbox installed and licensed.
%hasLicenseForToolbox = license('test', 'image_toolbox');	% Check for Image Processing Toolbox.
% hasLicenseForToolbox = license('test', 'Image_Acquisition_Toolbox');	% Check for Image Acquisition Toolbox.
% hasLicenseForToolbox = license('test', 'Statistics_Toolbox');	% Check for Statistics and Machine Learning Toolbox.
hasLicenseForToolbox = license('test', 'Signal_Toolbox');	% Check for Signal Processing Toolbox.
% hasLicenseForToolbox = license('test', 'Video_and_Image_Blockset');	% Check for Computer Vision System Toolbox.
% hasLicenseForToolbox = license('test', 'Neural_Network_Toolbox');	% Check for Deep Learning Toolbox.
if ~hasLicenseForToolbox
    % User does not have the toolbox installed, or if it is, there is no available license for it.
    % For example, there is a pool of 10 licenses and all 10 have been checked out by other people already.
    ver % List what toolboxes the user has licenses available for.
    message = sprintf('Sorry, but you do not seem to have the Signal Processing Toolbox.\nDo you want to try to continue anyway?');
    reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
    if strcmpi(reply, 'No')
        % User said No, so exit.
        return;
    end
else
    fprintf('You do have a license for that toolbox, even though it may be installed.\n')
end