[BlueGalactic]

In the Line "KindOf = PRELOAD STRUCTURE SELECTABLE CAN_ATTACK ATTACK_NEEDS_LINE_OF_SIGHT STICK_TO_TERRAIN_SLOPE SCORE FS_BASE_DEFENSE GARRISONABLE_UNTIL_DESTROYED IMMUNE_TO_CAPTURE TRANSPORT ;IMMOBILE", there was a ; before the word IMMOBILE. As a result, WorldBuilder complained that ChinaTankBunker didn't have the word IMMOBILE (since it was read as a comment), but should have. I removed the semicolon and WorldBuilder worked. That was the only flaw.