In the Project menu, check if the Create automatically option is checked.
Change Have you checked this on Eclipse or in the file browser? Eclipse sometimes takes a long time to update changes to the file system. Perform the upgrade by right-clicking the bin folder and clicking โRefreshโ in the context menu.
Edit : check your build path, try reconfiguring it from scratch, I don't know if this will help, but who knows ...
Fernando briano
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