UC Crash

[UltraCustomizer]: Task #36138 for UltraCustomizer v1.8.9 generated an exception
Console23:22:41
java.lang.NoClassDefFoundError: me/TechsCode/UltraCustomizer/base/visual/HexColor
at com.kihron.upcvariables.guis.OverviewVars.InstalledAddonsButton(OverviewVars.java:65) ~[?:?]
at me.TechsCode.UltraCustomizer.base.gui.GUI.lambda$null$2(GUI.java:69) ~[UltraCustomizer.jar:?]
at java.util.HashMap.forEach(HashMap.java:1420) ~[?:?]
at me.TechsCode.UltraCustomizer.base.gui.GUI.lambda$new$3(GUI.java:67) ~[UltraCustomizer.jar:?]
at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftTask.run(CraftTask.java:101) ~[paper-1.18.1.jar:git-Paper-133]
at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:483) ~[paper-1.18.1.jar:git-Paper-133]
at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1547) ~[paper-1.18.1.jar:git-Paper-133]
at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:480) ~[paper-1.18.1.jar:git-Paper-133]
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1470) ~[paper-1.18.1.jar:git-Paper-133]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1264) ~[paper-1.18.1.jar:git-Paper-133]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317) ~[paper-1.18.1.jar:git-Paper-133]
at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: java.lang.ClassNotFoundException: me.TechsCode.UltraCustomizer.base.visual.HexColor
... 12 more