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java.lang.NullPointerException: 	at org.intellij.plugins.ceylon.ide.ceylonCode.psi.CeylonFile.ensureTypechecked(CeylonFile.java:250)	at org.intellij.plugins.ceylon.ide.ceylonCode.psi.CeylonFile.ensureTypechecked(CeylonFile.java:260)	at org.intellij.plugins.ceylon.ide.ceylonCode.psi.CeylonFile.ensureTypechecked(CeylonFile.java:256)	at org.intellij.plugins.ceylon.ide.ceylonCode.resolve.CeylonImplementationsSearch$1run_.run(CeylonImplementationsSearch.ceylon:158)	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:950)	at org.intellij.plugins.ceylon.ide.ceylonCode.resolve.CeylonImplementationsSearch.scanPhasedUnits$priv$(CeylonImplementationsSearch.ceylon:163)	at org.intellij.plugins.ceylon.ide.ceylonCode.resolve.CeylonImplementationsSearch.findImplementors$priv$(CeylonImplementationsSearch.ceylon:115)	at org.intellij.plugins.ceylon.ide.ceylonCode.resolve.CeylonImplementationsSearch.execute(CeylonImplementationsSearch.ceylon:61)	at org.intellij.plugins.ceylon.ide.ceylonCode.resolve.CeylonImplementationsSearch.execute(CeylonImplementationsSearch.ceylon:56)	at com.intellij.util.ExecutorsQuery.processResults(ExecutorsQuery.java:45)	at com.intellij.util.AbstractQuery.forEach(AbstractQuery.java:75)	at com.intellij.util.UniqueResultsQuery.process(UniqueResultsQuery.java:66)	at com.intellij.util.UniqueResultsQuery.forEach(UniqueResultsQuery.java:56)	at com.intellij.codeInsight.navigation.ImplementationSearcher$FirstImplementationsSearcher$1.run(ImplementationSearcher.java:152)	at com.intellij.openapi.progress.impl.CoreProgressManager$5.run(CoreProgressManager.java:227)	at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:563)	at com.intellij.openapi.progress.impl.CoreProgressManager$8.run(CoreProgressManager.java:357)	at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:142)	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:446)	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:392)	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:127)	at com.intellij.openapi.application.impl.ApplicationImpl$13$1.run(ApplicationImpl.java:633)	at com.intellij.openapi.application.impl.ApplicationImpl$8.run(ApplicationImpl.java:369)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)