WARNING: failed _ah_ServeBlobFilter: java.lang.ClassCastException:

I've been working on a project for a while and been testing fine. I
just started getting the following exception. I created a new project
that works ok.

WARNING: failed _ah_ServeBlobFilter: java.lang.ClassCastException:
com.google.appengine.tools.development.ApiProxyLocalImpl cannot be
cast to com.google.appengine.tools.development.ApiProxyLocal
Jan 3, 2012 3:55:31 PM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: Failed startup of context
com.google.appengine.tools.development.DevAppEngineWebAppContext@4390e5dc{/,/
Users/bucky/Documents/workspace/Online Beacon 0.2.5/war}
java.lang.ClassCastException:
com.google.appengine.tools.development.ApiProxyLocalImpl cannot be
cast to com.google.appengine.tools.development.ApiProxyLocal
at
com.google.appengine.api.blobstore.dev.ServeBlobFilter.init(ServeBlobFilter.java:
53)
at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:
97)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:
50)
at
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:
662)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:
1250)
at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:
517)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:
467)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:
50)
at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:
130)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:
50)
at
org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:
130)
at org.mortbay.jetty.Server.doStart(Server.java:224)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:
50)
at
com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:
191)
at
com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:
239)
at
com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:
146)
at
com.google.appengine.tools.development.gwt.AppEngineLauncher.start(AppEngineLauncher.java:
97)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811)
at com.google.gwt.dev.DevMode.main(DevMode.java:311)

Any suggestions on what I changed to cause this?

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