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java.lang.NullPointerException: 	at assignment.run_.run(run.ceylon:7)	at assignment.run_.main(run.ceylon)	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 ceylon.modules.api.runtime.SecurityActions.invokeRunInternal(SecurityActions.java:57)	at ceylon.modules.api.runtime.SecurityActions.invokeRun(SecurityActions.java:48)	at ceylon.modules.api.runtime.AbstractRuntime.invokeRun(AbstractRuntime.java:68)	at ceylon.modules.api.runtime.AbstractRuntime.execute(AbstractRuntime.java:105)	at ceylon.modules.api.runtime.AbstractRuntime.execute(AbstractRuntime.java:101)	at ceylon.modules.Main.execute(Main.java:69)	at ceylon.modules.Main.main(Main.java:42)	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 org.jboss.modules.Module.run(Module.java:308)	at org.jboss.modules.Main.main(Main.java:487)	at ceylon.modules.bootstrap.CeylonRunTool.run(CeylonRunTool.java:281)	at com.redhat.ceylon.common.tools.CeylonTool.run(CeylonTool.java:520)	at com.redhat.ceylon.common.tools.CeylonTool.execute(CeylonTool.java:405)	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.redhat.ceylon.launcher.Launcher.runInJava7Checked(Launcher.java:115)	at com.redhat.ceylon.launcher.Launcher.run(Launcher.java:41)	at com.redhat.ceylon.launcher.Launcher.run(Launcher.java:34)	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.redhat.ceylon.launcher.Bootstrap.run(Bootstrap.java:126)	at com.redhat.ceylon.launcher.Bootstrap.main(Bootstrap.java:76)