This hasn't happened to me in a long time, but it happened today when building the gradle source, so I figured I'd report it.
:docs:groovydoc FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':docs:groovydoc'. Cause: java.io.IOException: Unable to delete directory C:\gradle\subprojects\docs\build\tmp\groovydoc\org\gradle\plugins\signing\type. Cause: Unable to delete directory C:\gradle\subprojects\docs\build\tmp\groovydoc\org\gradle\plugins\signing\type. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. BUILD FAILED -Spencer
