Why won't my code work in R2015b?

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I created a GUI in MATLAB R2013b and it works fine, but when I try and run the same program in R2015b I get errors. What could be some potential problems as to why it won't work?

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mlb452 2017-7-19

Now the original errors are popping back up. They say:

Error using fprintf. Invalid file identifier. Use fopen to generate a valid file identifier

Error while evaluating UIControl Callback.

Again, when I run this with R2013b, I get no errors. So I don't understand why I'm having issues with the fprintf now...

Steven Lord 2017-7-19

在 MATLAB Online 中打开

Error in poly_graph

That's not the whole text of the error message. You posted where the error occurs, but not what error occurred.

 Error using fprintf. Invalid file identifier.
 Use fopen to generate a valid file identifier

You called fopen to create a file identifier that you then passed to fprintf. Call fopen with two outputs. If the first is -1, display the second to learn more information about why fopen was not able to create a valid identifier.

Often this happens because you don't have write permission to the directory in which you're trying to create the file. If you're trying to write to a different directory in the different releases, that could explain why the code fails in one release but not in the other.

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