Error in Find peaks giving a error message saying parse_inputs

When I try running my matlab code, two errors pop up. I am new to matlab and still trying to understand it as it is needed for my classes. Here are the two errors I am recieving:

Error in findpeaks (line 136)

= parse_inputs(isInMATLAB,Yin,varargin{:});

Error in Lab2 (line 106)

avgMA1 = mean(abs(findpeaks(x1)));

Please let me know if you know any ways I can fix this! Thanks!

[KSSV]

What code you have tried which lead to this error?

What version you are using?