I got this error, and I'm not sure if it's about SSP or not, but I'll post it here and let the experts decide:
Spoiler
4925275 [Thread-11] INFO sound.OooOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO - Playing music with id [Sovereignty.ogg]
4925420 [Thread-5] ERROR com.fs.starfarer.combat.D - java.lang.RuntimeException: Error loading [graphics/ssp/backgrounds/ssp_arcade.png] resource, not found in [C:\Games\Starsector\starsector-core\..\mods\Starsector Plus,C:\Games\Starsector\starsector-core\..\mods\Blackrock Drive Yards,C:\Games\Starsector\starsector-core\..\mods\Citadel,C:\Games\Starsector\starsector-core\..\mods\Common Radar,C:\Games\Starsector\starsector-core\..\mods\Console Commands,C:\Games\Starsector\starsector-core\..\mods\Diable Avionics,C:\Games\Starsector\starsector-core\..\mods\Exigency 0.7.1b,C:\Games\Starsector\starsector-core\..\mods\Hiigaran Descendants,C:\Games\Starsector\starsector-core\..\mods\Interstellar Imperium,C:\Games\Starsector\starsector-core\..\mods\JP_RC,C:\Games\Starsector\starsector-core\..\mods\LazyLib,C:\Games\Starsector\starsector-core\..\mods\Neutrino corp,C:\Games\Starsector\starsector-core\..\mods\NewGalacticOrder v.0.7,C:\Games\Starsector\starsector-core\..\mods\Nexerelin,C:\Games\Starsector\starsector-core\..\mods\pn_0,41,C:\Games\Starsector\starsector-core\..\mods\Patria,C:\Games\Starsector\starsector-core\..\mods\Save Transfer,C:\Games\Starsector\starsector-core\..\mods\SCY,C:\Games\Starsector\starsector-core\..\mods\shadow_ships,C:\Games\Starsector\starsector-core\..\mods\Crystanite,C:\Games\Starsector\starsector-core\..\mods\Templars,C:\Games\Starsector\starsector-core\..\mods\mayorate-0.8.1,C:\Games\Starsector\starsector-core\..\mods\TwigLib,C:\Games\Starsector\starsector-core\..\mods\valkyrians,C:\Games\Starsector\starsector-core\..\mods\Version Checker,C:\Games\Starsector\starsector-core\..\mods\MusicLib,C:\Games\Starsector\starsector-core\..\mods\ShaderLib,../starfarer.res/res,CLASSPATH]
java.lang.RuntimeException: Error loading [graphics/ssp/backgrounds/ssp_arcade.png] resource, not found in [C:\Games\Starsector\starsector-core\..\mods\Starsector Plus,C:\Games\Starsector\starsector-core\..\mods\Blackrock Drive Yards,C:\Games\Starsector\starsector-core\..\mods\Citadel,C:\Games\Starsector\starsector-core\..\mods\Common Radar,C:\Games\Starsector\starsector-core\..\mods\Console Commands,C:\Games\Starsector\starsector-core\..\mods\Diable Avionics,C:\Games\Starsector\starsector-core\..\mods\Exigency 0.7.1b,C:\Games\Starsector\starsector-core\..\mods\Hiigaran Descendants,C:\Games\Starsector\starsector-core\..\mods\Interstellar Imperium,C:\Games\Starsector\starsector-core\..\mods\JP_RC,C:\Games\Starsector\starsector-core\..\mods\LazyLib,C:\Games\Starsector\starsector-core\..\mods\Neutrino corp,C:\Games\Starsector\starsector-core\..\mods\NewGalacticOrder v.0.7,C:\Games\Starsector\starsector-core\..\mods\Nexerelin,C:\Games\Starsector\starsector-core\..\mods\pn_0,41,C:\Games\Starsector\starsector-core\..\mods\Patria,C:\Games\Starsector\starsector-core\..\mods\Save Transfer,C:\Games\Starsector\starsector-core\..\mods\SCY,C:\Games\Starsector\starsector-core\..\mods\shadow_ships,C:\Games\Starsector\starsector-core\..\mods\Crystanite,C:\Games\Starsector\starsector-core\..\mods\Templars,C:\Games\Starsector\starsector-core\..\mods\mayorate-0.8.1,C:\Games\Starsector\starsector-core\..\mods\TwigLib,C:\Games\Starsector\starsector-core\..\mods\valkyrians,C:\Games\Starsector\starsector-core\..\mods\Version Checker,C:\Games\Starsector\starsector-core\..\mods\MusicLib,C:\Games\Starsector\starsector-core\..\mods\ShaderLib,../starfarer.res/res,CLASSPATH]
at com.fs.util.Object.Object(Unknown Source)
at com.fs.util.Object.?0000(Unknown Source)
at com.fs.graphics.TextureLoader.?0000(Unknown Source)
at com.fs.graphics.TextureLoader.o00000(Unknown Source)
at com.fs.graphics.TextureLoader.o00000(Unknown Source)
at com.fs.starfarer.util.ReplaceableSprite.OOO000(Unknown Source)
at com.fs.starfarer.campaign.BackgroundAndStars.super.super(Unknown Source)
at com.fs.starfarer.campaign.BaseLocation.renderBG(Unknown Source)
at com.fs.starfarer.campaign.CampaignEngine.renderBG(Unknown Source)
at com.fs.starfarer.campaign.ooOO.do.class(Unknown Source)
at com.fs.starfarer.new.?o000(Unknown Source)
at com.fs.oOOO.oOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO.?0000(Unknown Source)
at com.fs.starfarer.combat.D.o00000(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$2.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Thanks in advance for any input.