org.sonar.runner.impl.RunnerException: Unable to execute Sonar

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org.sonar.runner.impl.RunnerException: Unable to execute Sonar
at org.sonar.css.checks.BulletproofFontFace.visitNode(BulletproofFontFace.java:67)
at com.sonar.sslr.impl.ast.AstWalker.visitNode(AstWalker.java:114)
at com.sonar.sslr.impl.ast.AstWalker.visit(AstWalker.java:85)
at com.sonar.sslr.impl.ast.AstWalker.visitChildren(AstWalker.java:99)
at com.sonar.sslr.impl.ast.AstWalker.visit(AstWalker.java:87)
at com.sonar.sslr.impl.ast.AstWalker.visitChildren(AstWalker.java:99)
at com.sonar.sslr.impl.ast.AstWalker.visit(AstWalker.java:87)
at org.sonar.plugins.css.CssSquidSensor.analyse(CssSquidSensor.java:91)
at org.sonar.batch.phases.SensorsExecutor.executeSensor(SensorsExecutor.java:59)
at org.sonar.batch.phases.SensorsExecutor.execute(SensorsExecutor.java:51)
at org.sonar.batch.phases.DatabaseModePhaseExecutor.execute(DatabaseModePhaseExecutor.java:120)
at org.sonar.api.platform.ComponentContainer.startComponents(ComponentContainer.java:92)
at org.sonar.batch.scan.ProjectScanContainer.scan(ProjectScanContainer.java:235)
at org.sonar.batch.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:230)
at org.sonar.batch.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:228)
at org.sonar.api.platform.ComponentContainer.startComponents(ComponentContainer.java:92)
at org.sonar.batch.scan.ScanTask.scan(ScanTask.java:57)
at org.sonar.batch.scan.ScanTask.execute(ScanTask.java:45)
at org.sonar.api.platform.ComponentContainer.startComponents(ComponentContainer.java:92)
at org.sonar.batch.bootstrap.GlobalContainer.executeTask(GlobalContainer.java:158)
at org.sonar.batch.bootstrapper.Batch.executeTask(Batch.java:95)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.sonar.runner.impl.BatchLauncher$1.delegateExecution(BatchLauncher.java:87)
at org.sonar.runner.impl.BatchLauncher.doExecute(BatchLauncher.java:69)
at org.sonar.runner.impl.BatchLauncher.execute(BatchLauncher.java:50)
at org.sonar.runner.api.EmbeddedRunner.doExecute(EmbeddedRunner.java:102)
at org.sonar.runner.Main.executeTask(Main.java:70)
at org.sonar.runner.Main.execute(Main.java:59)
at org.sonar.runner.Main.main(Main.java:53)

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