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When first used, the reader needs to calibrate the touchscreen. To this end, little 'X''s will appear in the corner of your screen - you need to tap in the middle of those. My best guess is that since you randomly tapped the screen instead it figured there was something wrong with the device, hence the error.
Start it up again and look for the tell-tale 'X' somewhere on screen - I don't recall where the first one appears, either a corner or the center I think, but it should be fairly obvious.
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