Error Message Please Help

When I run sketches on my Arduino Uno I get this error message

"Arduino: 1.6.3 (Mac OS X), Board: "Arduino/Genuino Uno avr-gcc: error: core.a: No such file or directory
Error compiling."

I don't know what I am doing wrong. I just finished a project on my board a few days ago and everything was fine. Can someone please help me fix this error.

Wdrummer:
Can someone please help me fix this error.

Without seeing the code that causes the error:

A mind-reader perhaps?

Wdrummer:
When I run sketches on my Arduino Uno I get this error message

"Arduino: 1.6.3 (Mac OS X), Board: "Arduino/Genuino Uno avr-gcc: error: core.a: No such file or directory
Error compiling."

I don't know what I am doing wrong. I just finished a project on my board a few days ago and everything was fine. Can someone please help me fix this error.

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jurs:
Without seeing the code that causes the error:

A mind-reader perhaps?

I don't think it is not a problem with the code. I have ran all the basic examples like the blink sketch and I still got the same error. Maybe it is something wrong with the Arduino Software.

Wdrummer:
I don't think it is not a problem with the code. I have ran all the basic examples like the blink sketch and I still got the same error. Maybe it is something wrong with the Arduino Software.

Maybe you have moved some essential folders of the Arduino core into some other folders where they do not belong? Perhaps by doing a drag-and-drop operation in some file manager software accidentally while browsing files?

Perhaps better re-install the Arduino-IDE.