gistfile1.txt

Caused by: java.lang.reflect.InvocationTargetException
        at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:421)
        at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
        at org.eclipse.ui.internal.progress.ProgressMonitorJobsDialog.run(ProgressMonitorJobsDialog.java:275)
        at org.eclipse.ui.internal.progress.ProgressManager$5.run(ProgressManager.java:960)
        at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
        at org.eclipse.ui.internal.progress.ProgressManager.busyCursorWhile(ProgressManager.java:995)
        at org.eclipse.ui.internal.progress.ProgressManager.busyCursorWhile(ProgressManager.java:970)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:92)
        at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:30)
        ... 26 more
Caused by: java.lang.IllegalArgumentException: No implementation of method: :can-modify? of protocol: #'cemerick.pomegranate/URLClasspath found for class: org.eclipse.core.runtime.internal.adaptor.ContextFinder
        at clojure.core$_cache_protocol_fn.invoke(core_deftype.clj:495)
        at cemerick.pomegranate$eval3673$fn__3697$G__3653__3703.invoke(pomegranate.clj:24)
        at leiningen.core.project$ensure_dynamic_classloader.invoke(project.clj:192)
        at leiningen.core.project$load_plugins.invoke(project.clj:198)
        at leiningen.core.project$load_plugins.invoke(project.clj:200)
        at leiningen.core.project$read.invoke(project.clj:239)
        at leiningen.core.project$read.invoke(project.clj:242)
        at ccw.leiningen.util$lein_project.invoke(util.clj:23)
        at ccw.leiningen.nature$lein_entries.invoke(nature.clj:155)
        at ccw.leiningen.nature$reset_project_build_path.doInvoke(nature.clj:204)
        at clojure.lang.RestFn.invoke(RestFn.java:442)
        at ccw.leiningen.handlers$upgrade_project_build_path$fn__4569.invoke(handlers.clj:114)
        at ccw.util.eclipse$eval2933$fn$reify__2935.run(eclipse.clj:216)
        at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)