# Answer to Question #15812 in MatLAB | Mathematica | MathCAD | Maple for Gianluca Oderda

Question #15812

Using the Matlab builder, I compile a Matlab .m function doing the sum of two vectors into an XL add in. Then I install the add in. But when I try to use the function, I get the following message: "Error in prova.Class1.1_0". What am I doing wrong? I use Matlab 2012a and the related compiler to build my xla. The XL version I use is the 2002 one...

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