Processing with eclipse missing library core.jar.

I am using processing with eclipse and I have gotten it working well, but then I open my project and it fails to compile when I make changes. I checked errors and now I have build path error "missing required library core.jar". I have no idea why it is not working anymore. Can anyone help?

I have checked the build path, and the libraries are implemented correctly.

Screen Shot 2017-01-31 at 10.47.03 AM

Screen Shot 2017-01-31 at 10.46.17 AM

And yet this error is still occurring.

Screen Shot 2017-01-31 at 10.46.34 AM

Anyone know what could have happened? Again, I have been able to build this project before, but now, after no changes to the build path, I am getting an error.



  • Answer ✓

    Still no idea what cause this, but deleting core.jar from the build path and then re-adding got rid of the error.

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