Okay, I too have some strange goings on with tyres and GP3 2000.
Usually I will always use wbridgRH01_0.jam and wbridgRH01_1 as the slow and fast types which work perfectly, no probs.
But if I select any other tyre jam I get the error that is shown above with the livery of the car on the tyre. I have tried everything I can think of with no luck - even made a copy of the jam files, renamed them COPYwbridgRH01_0 and COPYwbridgRH01_1, selected these new jams in GPxPatch\Season set\Tyres, cross-checked in the *.set file that it matched, and still the same daft error. It is the same if I try and choose any other tyre jam at all, other than the RH01 jams.
Btw, as long as I have the internal SW jams working fine then I can freely change the external HW bmps at will.
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The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function. -- F.Scott Fitzgerald