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Attempting to do some work on an Android project I haven't worked on for a couple of months, yet every time I attempt to build the project Eclipse throws up a dialog saying: 'Building workspace' has encountered a problem Errors occurred during the build. Errors running builder 'Android Pre Compiler' on project 'XXX' java.lang.NullPointerException I'm running Eclipse on a Mac with an Android project build target 4.0.3 (API Level 15) and I've the following versions of things installed Eclipse - 3.7.2 Android Development Tools - 21.0.1 Android SDK - up to 17 I've already tried a few things, like starting a whole new workspace, installing this 'Subversive SVN JDT Ignore Extensions', upgrading everything, making sure I don't have any files without extensions in my source folder (or anywhere else), ensuring my Java compiler is 1.6 and switching it off and on again. EDIT Here's the stack trace from the Eclipse error log for this problem: java.lang.NullPointerException at com.android.ide.eclipse.adt.internal.build.builders.PreCompilerBuilder.build(PreCompilerBuilder.java:673) at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239) at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295) at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351) at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374) at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:513) a

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