Use of & not working

[Nasserbadra]

I am new to IRIS and I am using IRIS on my MACPRO, however, when I run the attached script it returns an error. The exact error mgs is as follows. Appreciate any help in solving the problem. P.S. I think the error is related to mac version as I had to amend several commands by adding "" instead of '' per say.

Index exceeds the number of array elements. Index must not exceed 0.
Error in model.Incidence/getMinMaxShifts (line 87)
minSh = pos(1) - sh0;
Error in model/getActualMinMaxShifts (line 3)
[dynamicMinSh, dynamicMaxSh] = getMinMaxShifts(this.Incidence.Dynamic);
Error in model/createSourceDb (line 55)
[minSh, maxSh] = getActualMinMaxShifts(this);
Error in model/zerodb (line 58)
d = createSourceDb(this, range, varargin{:}, "deviation", deviation);
Error in a5_IRF_vs_old (line 45)
d_old = zerodb(m_old,frng);
Script.txt