gen already exists but is not a source folder

Question

I am developing my Android project, After I removed a unused library, I got the error:

myproject/gen already exists but is not a source fold         


        

Answer 1

The gen folder is where ADT creates the R.java file, which specifies your resource definitions. i.e. your resources (colours, dimensions, layouts, etc) are converted to code, and placed in R.java in the gen folder.

So when you build the app you need to ensure the gen folder is treated as a source code folder by your IDE, as it contains the R class.

In your IDE, you need to mark the gen folder as a source folder, so its content are built alongside your source.

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