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:170)
at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:182)
at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:182)
at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:182)
at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:182)
at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:182)
at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:182)
at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:182)
at com.intellij.openapi.vfs.VfsUtilCore.visitChildrenRecursively(VfsUtilCore.java:162)
at com.intellij.openapi.roots.impl.FileIndexImplUtil.iterateRecursively(FileIndexImplUtil.java:33)
at com.github.kumaraman21.intellijbehave.resolver.StepPsiReference.resolve(StepPsiReference.java:60)
at com.github.kumaraman21.intellijbehave.codeInspector.UnusedStepsInspection$1.visitElement(UnusedStepsInspection.java:101)
at com.intellij.psi.JavaElementVisitor.visitAnnotation(JavaElementVisitor.java:340)
at com.intellij.psi.impl.source.tree.java.PsiAnnotationImpl.accept(PsiAnnotationImpl.java:111)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.a(LocalInspectionsPass.java:403)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.a(LocalInspectionsPass.java:361)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass.access$100(LocalInspectionsPass.java:76)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass$2.process(LocalInspectionsPass.java:327)
at com.intellij.codeInsight.daemon.impl.LocalInspectionsPass$2.process(LocalInspectionsPass.java:309)
at com.intellij.concurrency.JobUtil$2$1.run(JobUtil.java:117)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:218)
at com.intellij.concurrency.JobUtil$2.process(JobUtil.java:115)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at com.intellij.concurrency.PrioritizedFutureTask.access$101(PrioritizedFutureTask.java:31)
at com.intellij.concurrency.PrioritizedFutureTask$1.run(PrioritizedFutureTask.java:70)
at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1053)
at com.intellij.concurrency.PrioritizedFutureTask.run(PrioritizedFutureTask.java:97)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)

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