How to solve sources folder not writable in Netbeans

This article is solely written to try to solve problem arises regarding on some step done in Netbeans GUI Editor. It is when an already created application project is going to be opened but there is an error triggered showing that the source of the application project itself is not writable. So, this article is written to give an alternative on how to solve error generated as sources folder not writable in Netbeans GUI Editor. Below is the image or the picture which is presented based on the error described before :

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