[ERROR] Error occurred while enabling RPMain v1.0 (Is it up to date?)

java.lang.NullPointerException: null

at com.xxxtrigger50xxx.OpenGUI.constructReadInventories(OpenGUI.java:154) ~[?:?]

at com.xxxtrigger50xxx.RolePlayMain.onEnable(RolePlayMain.java:22) ~[?:?]

at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[spigot-1.14.4.jar:git-Spigot-798ea6a-2012f1e]

at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:352) [spigot-1.14.4.jar:git-Spigot-798ea6a-2012f1e]

at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:417) [spigot-1.14.4.jar:git-Spigot-798ea6a-2012f1e]

at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin(CraftServer.java:461) [spigot-1.14.4.jar:git-Spigot-798ea6a-2012f1e]

at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins(CraftServer.java:375) [spigot-1.14.4.jar:git-Spigot-798ea6a-2012f1e]

at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:449) [spigot-1.14.4.jar:git-Spigot-798ea6a-2012f1e]

at net.minecraft.server.v1_14_R1.DedicatedServer.init(DedicatedServer.java:266) [spigot-1.14.4.jar:git-Spigot-798ea6a-2012f1e]

at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:775) [spigot-1.14.4.jar:git-Spigot-798ea6a-2012f1e]

at java.lang.Thread.run(Thread.java:813) [?:1.8.0_212]