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java.lang.NullPointerException: 	at com.ns_team.commands_system.CommandManager.executeCommandString(CommandManager.java:50)	at com.ns_team.Main.main(Main.java:15)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)