java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException	at com.solarmetric.modules.integration.eclipse.PluginClassLoader.extensions(PluginClassLoader.java:122)	at com.solarmetric.modules.integration.eclipse.PluginClassLoader.getProjectClasspath(PluginClassLoader.java:78)	at com.solarmetric.modules.integration.eclipse.PluginClassLoader.<init>(PluginClassLoader.java:28)	at com.solarmetric.modules.integration.eclipse.EnhancerBuilder$BuildVisitor.<init>(EnhancerBuilder.java:42)	at com.solarmetric.modules.integration.eclipse.EnhancerBuilder.build(EnhancerBuilder.java:30)	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:427)	at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1006)	at org.eclipse.core.runtime.Platform.run(Platform.java:413)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:125)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:181)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:191)	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:151)	at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1006)	at org.eclipse.core.runtime.Platform.run(Platform.java:413)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:165)	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:243)	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:212)	at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:181)	at org.eclipse.ui.actions.GlobalBuildAction$1.run(GlobalBuildAction.java:174)	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)