What steps will reproduce the problem?
1. 
2. 
3. 


-- Error Details --
Date: Fri Apr 20 08:36:03 CEST 2012
Message: An internal error occurred during: "Uploading Sources".
Severity: Error
Product: Eclipse Platform 4.2.0.v20120403-1921 (org.eclipse.platform.ide)
Plugin: org.eclipse.core.jobs
Session Data:
eclipse.buildId=I20120417-1000
java.version=1.7.0_b147-icedtea
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments:  -os linux -ws gtk -arch x86_64

Exception Stack Trace:
java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.http.impl.client.DefaultHttpClient.<init>(Lorg/apache/http/params/HttpParams;)V" the class loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) of the current class, org/fedoraproject/eclipse/packager/api/UploadSourceCommand, and the class loader (instance of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) for resolved class, org/apache/http/impl/client/DefaultHttpClient, have different Class objects for the type /http/params/HttpParams;)V used in the signature
	at org.fedoraproject.eclipse.packager.api.UploadSourceCommand.getClient(UploadSourceCommand.java:414)
	at org.fedoraproject.eclipse.packager.api.UploadSourceCommand.checkSourceAvailable(UploadSourceCommand.java:226)
	at org.fedoraproject.eclipse.packager.api.UploadSourceCommand.call(UploadSourceCommand.java:193)
	at org.fedoraproject.eclipse.packager.internal.handlers.UploadHandler$1.run(UploadHandler.java:152)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)