java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException: 	at com.github.kumaraman21.intellijbehave.resolver.DeclaredAnnotationSet.(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)