tum_ardrone - Waiting for first navdata to determine drone version

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I have a simular problem. I can start the gui node and the autopilot. The PTAM Drone Map View works also and I can control the drone. But in drone_stateestimation I get the same Waiting for first navdata to determine drone version, and in the ardrone_autonomy I get: Tag 4196 is an unknown navdata option tag One option (0) is not a valid option because its size is zero [Navdata] Checksum failed : 1096 (distant) / 54254 (local)

If anyone could help, this would be awesome.

I got the same error in the drone_stateestimation node. But, it is a slightly different situation for me. I get this error when I run a bag file recorded from a different machine.

It turned out that the Navdata message type had a different checksum in my ardrone autonomy driver and the other machines autonomy driver. The checksum is made purely from the file contents. So, I changed my msg/Navdata.msg file to look like the other one. Recompiling and running the bag file work there after.