R help - Jun 2012 - Error in text.rpart(fit) : fit is not a tree, just a root

Hi there

I am trying to perform Regression Tree Classification in R but I get the
following error:

fit is not a tree, just a root

Could you please clarify what this means? Does it mean I cannot use this method
for the data I have? (Data attached)

Kind regards

Jo Cairns
Research Doctorate
ESRC-funded CASE research in collaboration with the North East Public Health
Observatory
?
Department of Geography
Science Laboratories 
Durham University
South Road 
Durham
DH1 3LE
?
Email: j.m.cairns at durham.ac.uk
Website:
http://www.dur.ac.uk/geography/postgraduate/postgraduate_in_geography/current_research_students/?id=7083
Tel: 0191 3340252 (Mon & Tues) 3341817 (Weds-Fri)


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