Format: "plain" not recognized

[Kesanov]

guru.nidi.graphviz.engine.GraphvizException: Format: "plain" not recognized. Use one of:

	at guru.nidi.graphviz.engine.GraphvizCmdLineEngine.execute(GraphvizCmdLineEngine.java:92)
	at guru.nidi.graphviz.engine.Graphviz.execute(Graphviz.java:184)
	at guru.nidi.graphviz.engine.Renderer.toString(Renderer.java:46)
	at callgraph.Utils.getLayoutFromGraphViz(Utils.kt:300)
	at callgraph.Utils.layout(Utils.kt:115)
	at callgraph.CanvasBuilder.buildGraph(CanvasBuilder.kt:39)
	at callgraph.CanvasBuilder.build(CanvasBuilder.kt:27)
	at callgraph.CallGraphToolWindow$run$1.run(CallGraphToolWindow.kt:217)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:945)
	at callgraph.Utils$runBackgroundTask$1.run(Utils.kt:131)
	at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:731)
	at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:164)
	at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:586)
	at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:532)
	at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:86)
	at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:151)
	at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:403)
	at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:311)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Format: "plain" not recognized. Use one of:

	at guru.nidi.graphviz.service.DefaultExecutor.execute(DefaultExecutor.java:57)
	at guru.nidi.graphviz.service.CommandRunner.exec(CommandRunner.java:45)
	at guru.nidi.graphviz.service.CommandRunner.exec(CommandRunner.java:54)
	at guru.nidi.graphviz.service.CommandRunner.exec(CommandRunner.java:49)
	at guru.nidi.graphviz.engine.GraphvizCmdLineEngine.execute(GraphvizCmdLineEngine.java:83)
	... 22 more