I'm using Eclipse 3.0.0 (build ). I used update manager to install PyDev 0.5.3. The installation itself was successfull, i.e. the python files have 'P' icon and I can configure PyDev from Windows->Preferences->Pydev.
However, when I try to open .py file, I get error message with caption "Problems Opening Editor" and message: Unable to instantiate editor: org.python.pydev.editor.PythonEditor java.lang.NoClassDefFoundError: org/eclipse/jface/text/source/projection/ProjectionViewer
First, sorry for posting to wrong forum. Secondly, I upgraded to 3.0.1 and now it works.
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