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The biggest issue that causes this fault on these is one of the micro switch/sensors that send signals to the roof control unit on what position the roof components are in.When one fails it sends a false message saying part of the roof is open or didnt close properly which in turn you see this message here.Usually this requires a dealers SDS machine or compatible scan tool to check the fault codes in the roof computer as well as monitor the switches to locate the one at fault needing replaced as there are several of these.
One thing you can check is with your trunk open and your roof in the closed position there should be two flaps on the inside of the trunk lid that should be flush up against the trunk lid.If one is hanging even slightly more then the other Mercedes had released a bulletin to replace the gear housings for these flaps to correct this issue and this can cause this fault as well.
Other then this if these flaps are snug up against the interior of the trunk lid then a scan tool or dealers sds machine is needed to read the switches to locate the one at fault needing replaced.
Diagnosis for this can usually be around an hour and repair will vary depending on which is at fault.
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