Relevant portion of the Log. Weird issue; I can confirm that WS 003 is present in the base .ship.
2076630 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Finished saving
2076630 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Loading stage 9 (exception)
2076630 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Loading stage 10 (exception)
2076630 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Loading stage 11 (exception)
2076630 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Loading stage 12 (exception)
2076631 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Loading stage 13 (exception)
2076631 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Loading stage 14 (exception)
2076631 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Loading stage 15 (exception)
2076631 [Thread-4] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Loading stage 16 (exception)
2076833 [Thread-4] ERROR com.fs.starfarer.combat.CombatMain - java.lang.RuntimeException: Slot id [WS 003] not found on hull [falcon_p]
java.lang.RuntimeException: Slot id [WS 003] not found on hull [falcon_p]
at com.fs.starfarer.campaign.fleet.CampaignFleetMemberView.renderWeapons(Unknown Source)
at com.fs.starfarer.campaign.fleet.CampaignFleetMemberView.renderSingle(Unknown Source)
at com.fs.starfarer.campaign.fleet.CampaignFleetMemberView.render(Unknown Source)
at com.fs.starfarer.campaign.fleet.CampaignFleetView.render(Unknown Source)
at com.fs.starfarer.campaign.fleet.CampaignFleet.render(Unknown Source)
at com.fs.starfarer.campaign.BaseCampaignEntity.render(Unknown Source)
at com.fs.graphics.LayeredRenderer.render(Unknown Source)
at com.fs.starfarer.campaign.BaseLocation.render(Unknown Source)
at com.fs.starfarer.campaign.CampaignEngine.render(Unknown Source)
at com.fs.starfarer.campaign.CampaignState.render(Unknown Source)
at com.fs.starfarer.BaseGameState.traverse(Unknown Source)
at com.fs.state.AppDriver.begin(Unknown Source)
at com.fs.starfarer.combat.CombatMain.main(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)