Importing an existing project into Intellij generates an exception

[TimvdLippe]

I tried to do this:

I expected this to happen:

Instead, this happened:

Error while indexing /home/tim/Projects/spoofax-typescript/typescript/src-gen/ds-signatures/typescript-sig.ds
To reindex this file IDEA has to be restarted: Unhandled exception
org.metaborg.core.MetaborgRuntimeException: Unhandled exception
	at org.metaborg.intellij.idea.parsing.SpoofaxHighlightingLexer.parseAll(SpoofaxHighlightingLexer.java:156)
	at org.metaborg.intellij.idea.parsing.SpoofaxHighlightingLexer.start(SpoofaxHighlightingLexer.java:137)
	at com.intellij.openapi.editor.ex.util.LexerEditorHighlighter.doSetText(LexerEditorHighlighter.java:336)
	at com.intellij.openapi.editor.ex.util.LexerEditorHighlighter.setText(LexerEditorHighlighter.java:317)
	at com.intellij.psi.impl.cache.impl.id.PlatformIdTableBuilding$TokenSetTodoIndexer.map(PlatformIdTableBuilding.java:165)
	at com.intellij.psi.impl.cache.impl.id.PlatformIdTableBuilding$TokenSetTodoIndexer.map(PlatformIdTableBuilding.java:142)
	at com.intellij.psi.impl.cache.impl.todo.TodoIndex$4.map(TodoIndex.java:108)
	at com.intellij.psi.impl.cache.impl.todo.TodoIndex$4.map(TodoIndex.java:100)
	at com.intellij.util.indexing.MapReduceIndex.update(MapReduceIndex.java:461)
	at com.intellij.util.indexing.FileBasedIndexImpl.updateSingleIndex(FileBasedIndexImpl.java:1631)
	at com.intellij.util.indexing.FileBasedIndexImpl.lambda$doIndexFileContent$16(FileBasedIndexImpl.java:1567)
	at com.intellij.openapi.fileTypes.impl.FileTypeManagerImpl.freezeFileTypeTemporarilyIn(FileTypeManagerImpl.java:507)
	at com.intellij.util.indexing.FileBasedIndexImpl.doIndexFileContent(FileBasedIndexImpl.java:1528)
	at com.intellij.util.indexing.FileBasedIndexImpl.indexFileContent(FileBasedIndexImpl.java:1513)
	at com.intellij.util.indexing.UnindexedFilesUpdater.lambda$indexFiles$0(UnindexedFilesUpdater.java:107)
	at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$0(CacheUpdateRunner.java:235)
	at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1054)
	at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.lambda$run$1(CacheUpdateRunner.java:252)
	at com.intellij.openapi.progress.impl.CoreProgressManager$3.run(CoreProgressManager.java:179)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:568)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:519)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:164)
	at com.intellij.openapi.project.CacheUpdateRunner$MyRunnable.run(CacheUpdateRunner.java:248)
	at com.intellij.openapi.application.impl.ApplicationImpl$2.run(ApplicationImpl.java:309)
	at java.util.concurrent.Executors$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)
Caused by: org.metaborg.core.syntax.ParseException: java.io.IOException: Could not load parse table from zip:jar:file:///home/tim/Projects/spoofax-intellij/org.metaborg.intellij/build/idea-sandbox/plugins/org.metaborg.intellij/lib/org.metaborg.spoofax-common-2.3.0-SNAPSHOT.jar!/languages/dynsem-2.3.0-SNAPSHOT.spoofax-language!/target/metaborg/sdf-new.tbl
	at org.metaborg.spoofax.core.syntax.JSGLRParseService.parse(JSGLRParseService.java:93)
	at org.metaborg.spoofax.core.syntax.JSGLRParseService.parse(JSGLRParseService.java:1)
	at org.metaborg.core.syntax.SyntaxService.parse(SyntaxService.java:38)
	at org.metaborg.core.syntax.ISyntaxService.parse(ISyntaxService.java:59)
	at org.metaborg.intellij.idea.parsing.SpoofaxHighlightingLexer.parseAll(SpoofaxHighlightingLexer.java:154)
	... 29 more
Caused by: java.io.IOException: Could not load parse table from zip:jar:file:///home/tim/Projects/spoofax-intellij/org.metaborg.intellij/build/idea-sandbox/plugins/org.metaborg.intellij/lib/org.metaborg.spoofax-common-2.3.0-SNAPSHOT.jar!/languages/dynsem-2.3.0-SNAPSHOT.spoofax-language!/target/metaborg/sdf-new.tbl
	at org.metaborg.spoofax.core.syntax.FileParseTableProvider.parseTable(FileParseTableProvider.java:40)
	at org.metaborg.spoofax.core.syntax.JSGLRI.<init>(JSGLRI.java:49)
	at org.metaborg.spoofax.core.syntax.JSGLRParseService.parse(JSGLRParseService.java:86)
	... 33 more
Caused by: java.lang.NullPointerException
	at org.spoofax.jsglr.client.Disambiguator.yieldTreeTop(Disambiguator.java:379)
	at org.spoofax.jsglr.client.Disambiguator.applyFilters(Disambiguator.java:300)
	at org.spoofax.jsglr.client.Disambiguator.applyFilters(Disambiguator.java:261)
	at org.spoofax.jsglr.client.SGLR.sglrParse(SGLR.java:630)
	at org.spoofax.jsglr.client.SGLR.parse(SGLR.java:534)
	at org.spoofax.jsglr.client.ParseTable.parseProductionAttributes(ParseTable.java:352)
	at org.spoofax.jsglr.client.ParseTable.parseLabels(ParseTable.java:226)
	at org.spoofax.jsglr.client.ParseTable.parse(ParseTable.java:137)
	at org.spoofax.jsglr.client.ParseTable.<init>(ParseTable.java:106)
	at org.metaborg.spoofax.core.syntax.FileParseTableProvider.parseTable(FileParseTableProvider.java:38)
	... 35 more

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Spoofax: