This exception has no message.

Stack trace

java.lang.NullPointerException
	at com.github.kumaraman21.intellijbehave.resolver.DeclaredAnnotationSet.<init>(DeclaredAnnotationSet.java:48)
	at com.github.kumaraman21.intellijbehave.resolver.StepPsiReference$StepAnnotationFinder.processFile(StepPsiReference.java:89)
	at com.intellij.openapi.roots.impl.FileIndexImplUtil$1.visitFile(FileIndexImplUtil.java:38)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:167)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:179)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:179)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:179)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:179)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:179)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:179)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:179)
	at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:160)
	at com.intellij.openapi.roots.impl.FileIndexImplUtil.iterateRecursively(FileIndexImplUtil.java:33)
	at com.intellij.openapi.roots.impl.ProjectFileIndexImpl.iterateContent(ProjectFileIndexImpl.java:71)
	at com.github.kumaraman21.intellijbehave.resolver.StepPsiReference.resolve(StepPsiReference.java:60)
	at com.intellij.codeInsight.navigation.CtrlMouseHandler.resolve(CtrlMouseHandler.java:458)
	at com.intellij.codeInsight.navigation.CtrlMouseHandler.getInfoAt(CtrlMouseHandler.java:388)
	at com.intellij.codeInsight.navigation.CtrlMouseHandler.access$1500(CtrlMouseHandler.java:82)
	at com.intellij.codeInsight.navigation.CtrlMouseHandler$TooltipProvider.doExecute(CtrlMouseHandler.java:554)
	at com.intellij.codeInsight.navigation.CtrlMouseHandler$TooltipProvider.access$1400(CtrlMouseHandler.java:481)
	at com.intellij.codeInsight.navigation.CtrlMouseHandler$TooltipProvider$1$2$1.run(CtrlMouseHandler.java:538)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:848)
	at com.intellij.codeInsight.navigation.CtrlMouseHandler$TooltipProvider$1$2.run(CtrlMouseHandler.java:536)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:178)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:206)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:169)
	at com.intellij.codeInsight.navigation.CtrlMouseHandler$TooltipProvider$1.run(CtrlMouseHandler.java:531)
	at com.intellij.openapi.application.impl.ApplicationImpl$6.run(ApplicationImpl.java:422)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
	at com.intellij.openapi.application.impl.ApplicationImpl$1$1.run(ApplicationImpl.java:137)