Hey, Timid, some of the missions are failing to load up (i suspect to the is similar to what happened in the Content Unlocker mod of yours - so, possibly the vanilla ship variants name changes make it fail to load up).
The affected missions are:
-k1 Paladin's Vigil
-k2 Tactical Retreat
-k3 defender of the faith
-k6 Exodus
(edit: i checked the log, its an issue with OfficerManagerEvent in line 48 for K1, here is the log):
Spoiler
181285 [Thread-3] WARN com.fs.starfarer.title.ooOO.D - Error loading mission preview
java.lang.NoSuchMethodError: com.fs.starfarer.api.impl.campaign.events.OfficerManagerEvent.pickPortrait(Lcom/fs/starfarer/api/campaign/FactionAPI;Lcom/fs/starfarer/api/characters/FullName$Gender;)Ljava/lang/String;
at data.missions.vayra_k001.MissionDefinition.defineMission(MissionDefinition.java:48)
at com.fs.starfarer.title.ooOO.OO0OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO.<init>(Unknown Source)
at com.fs.starfarer.title.ooOO.D.setMission(Unknown Source)
at com.fs.starfarer.title.ooOO.if.notifyHotspotClicked(Unknown Source)
at com.fs.starfarer.ui.Object.B.o00000(Unknown Source)
at com.fs.starfarer.ui.Object.A.processInputImpl(Unknown Source)
at com.fs.starfarer.title.ooOO.if.processInputImpl(Unknown Source)
at com.fs.starfarer.ui.R.processInput(Unknown Source)
at com.fs.starfarer.E.int.processInputImpl(Unknown Source)
at com.fs.starfarer.ui.R.processInput(Unknown Source)
at com.fs.starfarer.ui.z.dispatchEventsToChildren(Unknown Source)
at com.fs.starfarer.ui.z.processInputImpl(Unknown Source)
at com.fs.starfarer.ui.R.processInput(Unknown Source)
at com.fs.starfarer.ui.z.dispatchEventsToChildren(Unknown Source)
at com.fs.starfarer.ui.z.processInputImpl(Unknown Source)
at com.fs.starfarer.ui.R.processInput(Unknown Source)
at com.fs.starfarer.title.TitleScreenState.processInput(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.o00000(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)