information displayed when an unexpected condition occurs, usually on a computer or other device

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Progress Box and Subversion Repository Backend to update user on revert progress

I am currently on a project that uses a Subversion Back End to commit/revert/lock content. Right now, I am trying to find a way to communicate to the user when a revert fails, why it failed. ...
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How to display errors with single LED?

I am working on a tiny hardware device which has a single LED that can be used to display errors (there are no other outputs). Actually it is a tri-color LED but the red color is dedicated to errors. ...