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From what you have described here this sounds like a possible fault with one of the several micro switches this roof uses for proper top operation.If one is sending an incorrect signal this causes the flashing red light/fault and the top will not operate.
Try retracting and extended the cover in the trunk/partition a few times to see if this then triggers the micro switch for it to see if it operates then properly.If this does not work then you will need to have the fault codes read/checked into to see what codes are set in the roof computer.This needs done with a scan tool that can plug in and communicate with the roof computer as some cheaper models are unable to do this.Once this is done if there are any codes set the codes can be diagnosed to locate and repair this issue.The scan tool is also used to clear out any fault codes that may have set when you tried to operate the top several times and in some cases this is all that may need done to allow top operation again.The scan tool is also used to monitor the micro switches to help locate any at fault needing replaced.
Unfortunately in some cases this is not an easy diagnosis or repair without knowing the codes set.Usually a dealer or repair center that can plug into your model will have to check the codes,clear the codes and check the micro switch signals.
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