233858 [Thread-4] ERROR com.fs.starfarer.combat.CombatMain - java.lang.AbstractMethodError: data.weapons.proj.drgKneecapperBombletOnHitEffect.onHit(Lcom/fs/starfarer/api/combat/DamagingProjectileAPI;Lcom/fs/starfarer/api/combat/CombatEntityAPI;Lorg/lwjgl/util/vector/Vector2f;ZLcom/fs/starfarer/api/combat/CombatEngineAPI;)V
java.lang.AbstractMethodError: data.weapons.proj.drgKneecapperBombletOnHitEffect.onHit(Lcom/fs/starfarer/api/combat/DamagingProjectileAPI;Lcom/fs/starfarer/api/combat/CombatEntityAPI;Lorg/lwjgl/util/vector/Vector2f;ZLcom/fs/starfarer/api/combat/CombatEngineAPI;)V
Your crash is the kneecapper from HTE. Did you grab the wrong version of HTE for your version of starsector?