How to detect problematic part of the code

Dear all,

in running my 300-lines code I encountered an error, saying that I do have nan inf in the input and I do not understand the underlying codes(functions). How can I determine which parameter of my code (fminimax) function causes that problem? Can somebody give me some feedback? thank you in advance. This is the error:

Error using svd

Input to SVD must not contain NaN or Inf.

Error in pinv (line 18)

[U,S,V] = svd(A,'econ');

Error in qpsub (line 462)

projSD = pinv(projH)*(-Zgf);

Error in nlconst (line 628)

= qpsub(HESS,gf,AN,-GT,[],[],XN,eq,-1, ...

Error in fminimax (line 492)

nlconst(ffun,xnew,l,u,full(A),B,full(Aeq),Beq,cfun,options,defaultopt, ...

Error in HomcChinFlagNewConvOneType4 (line 229)

[OptArgumShort, ~,~,exitflagShort] = fminimax(@(x)

CsShortParker*x,x0,AleqShortParker,bleqShortParker(:),AeqShortParker.',beqShortParker,lbShortParker,ubShortParker);