Here's what it says in the consol
Add-Ons/Vehicle_A_10.cs Line: 1 - Syntax error.
>>> Some error context, with ## on sides or error halt:
Atablock WheeledVehicleData(A-1##0##Vehicle)
{
^category + "vehicles";
^displayName = " ";
^ShapeFile = "./a-10.dts":
^emap = true;
^minMountDist = 3;
numMountPoints = 1;
mountThread[0] = "sit";
^maxDamage = 200.00;
^destroyedLevel = 200.00;
^energyPerDamadePoint = 160;
>>> Error report complete
ADD-ON "Vehicle_A-10" CONTAINS SYNTAX ERRORS