hELLO. i HAD THIS ISSUE AND SOLVED IT. All that needs to be done is check to make sure all the runways are concrete or asphalt and change if necessary. My runways were labled with numbers 128 insread of the correct texture
128 is correct, which indicates a transparent surface. In order to be accepted by ADE, you must probably configure it to run in P3D mode. But that would be a problem just for editing, the sim itself will accept the compiled scenery as it is, and it will have the same effect (transparent surface), which is REQUIRED, since the scenery has a full custom runway texture.
If you set it to concrete or anything else, you are both reducing performances (polygon overdraw), and risking issues like ground flickering.