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I’m confused & frustrated

888LM blinking red & yellow and beeping every 30 seconds

I installed 888LM to my model 1255R opener (Mfg. Date 04/99) using the red/white wires as in the instructions.  The 888LM Red & Yellow LEDs flash constantly and it beeps every 30 seconds.  

I would like help troubleshooting and fixing this issue.
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