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The Chamberlain whisper drive 6066 garage door opener is equipped with two safety features that may prevent the door from closing and cause the lights to flash.
The most common reason for the lights to flash on the garage door opener and the door not closing is that the safety reversing sensors are misaligned or obstructed; this is a safety feature of the garage door opener.
When properly connected and aligned, the sensor will detect an obstacle in the path of its electronic beam. If an obstruction breaks the light beam while the door is closing, the door will stop and reverse to full open position, and the opener lights will flash 10 times.
The garage door can be closed by pressing and holding the door control push bar until down travel is completed, if necessary.
just checking in on your question - did you check the sensors?