java.lang.NoClassDefFoundError

When opening up a pascal file I receive the above error.

Environment.

PhpStorm 2018.2.3
Build #PS-182.4323.68, built on September 13, 2018
JRE: 1.8.0_152-release-1248-b8 x86_64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.13.6

Stacktrace

java.lang.NoClassDefFoundError: com/intellij/codeInsight/folding/JavaCodeFoldingSettings
    at com.siberika.idea.pascal.lang.PascalFoldingBuilder.foldRoutines(PascalFoldingBuilder.java:192)
    at com.siberika.idea.pascal.lang.PascalFoldingBuilder.buildFoldRegions(PascalFoldingBuilder.java:121)
    at com.intellij.lang.folding.LanguageFolding.buildFoldingDescriptors(LanguageFolding.java:71)
    at com.intellij.codeInsight.folding.impl.FoldingUpdate.a(FoldingUpdate.java:239)
    at com.intellij.codeInsight.folding.impl.FoldingUpdate.getFoldingsFor(FoldingUpdate.java:225)
    at com.intellij.codeInsight.folding.impl.FoldingUpdate.a(FoldingUpdate.java:97)
    at com.intellij.codeInsight.folding.impl.FoldingUpdate.a(FoldingUpdate.java:86)
    at com.intellij.psi.impl.PsiParameterizedCachedValue.doCompute(PsiParameterizedCachedValue.java:45)
    at com.intellij.util.CachedValueBase.getValueWithLock(CachedValueBase.java:222)
    at com.intellij.psi.impl.PsiCachedValue.getValueWithLock(PsiCachedValue.java:60)
    at com.intellij.psi.impl.PsiParameterizedCachedValue.getValue(PsiParameterizedCachedValue.java:35)
    at com.intellij.psi.util.CachedValuesManager.getParameterizedCachedValue(CachedValuesManager.java:96)
    at com.intellij.codeInsight.folding.impl.FoldingUpdate.updateFoldRegions(FoldingUpdate.java:82)
    at com.intellij.codeInsight.folding.impl.CodeFoldingManagerImpl.a(CodeFoldingManagerImpl.java:298)
    at com.intellij.codeInsight.folding.impl.CodeFoldingManagerImpl.updateFoldRegionsAsync(CodeFoldingManagerImpl.java:284)
    at com.intellij.codeInsight.daemon.impl.CodeFoldingPass.doCollectInformation(CodeFoldingPass.java:42)
    at com.intellij.codeHighlighting.TextEditorHighlightingPass.collectInformation(TextEditorHighlightingPass.java:69)
    at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.d(PassExecutorService.java:423)
    at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1161)
    at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.c(PassExecutorService.java:416)
    at com.intellij.openapi.progress.impl.CoreProgressManager.a(CoreProgressManager.java:580)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:525)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:85)
    at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.a(PassExecutorService.java:415)
    at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.e(PassExecutorService.java:391)
    at com.intellij.openapi.application.impl.ReadMostlyRWLock.executeByImpatientReader(ReadMostlyRWLock.java:147)
    at com.intellij.openapi.application.impl.ApplicationImpl.executeByImpatientReader(ApplicationImpl.java:222)
    at com.intellij.codeInsight.daemon.impl.PassExecutorService$ScheduledPass.run(PassExecutorService.java:389)
    at com.intellij.concurrency.JobLauncherImpl$VoidForkJoinTask$1.exec(JobLauncherImpl.java:161)
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
    at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

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