Running rcov fails during post processing.

Anyone has found a fix for this incompatibility problem between rcov  
0.8.1.2 and rexml in ruby 1.8.7 ?

Thanks for any help.

Gaspard

--------------

versions:
rcov 0.8.1.2 2007-11-22
ruby 1.8.7 (2008-08-11 patchlevel 72) [i686-darwin9]


complete backtrace:
/opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:131:in `[]': no  
implicit conversion from nil to integer (TypeError)
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:131:in `wrap'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:131:in `wrap'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:90:in  
`write_text'
	from /opt/local/lib/ruby/1.8/rexml/formatters/default.rb:50:in `write'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:75:in  
`write_element'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:73:in `each'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:73:in  
`write_element'
	from /opt/local/lib/ruby/1.8/rexml/formatters/default.rb:31:in `write'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:75:in  
`write_element'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:73:in `each'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:73:in  
`write_element'
	from /opt/local/lib/ruby/1.8/rexml/formatters/default.rb:31:in `write'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:117:in  
`write_document'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:111:in `each'
	from /opt/local/lib/ruby/1.8/rexml/formatters/pretty.rb:111:in  
`write_document'
	from /opt/local/lib/ruby/1.8/rexml/formatters/default.rb:28:in `write'
	from /opt/local/lib/ruby/1.8/rexml/document.rb:195:in `write'
	from (eval):93:in `pretty'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/lib/rcov/ 
report.rb:1003:in `create_file'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/lib/rcov/ 
report.rb:708:in `execute'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/lib/rcov/ 
report.rb:125:in `each'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/lib/rcov/ 
report.rb:125:in `each_file_pair_sorted'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/lib/rcov/ 
report.rb:707:in `execute'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/lib/rcov.rb: 
640:in `dump_coverage_info'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/lib/rcov.rb: 
640:in `each'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/lib/rcov.rb: 
640:in `dump_coverage_info'
	from /opt/local/lib/ruby/gems/1.8/gems/rcov-0.8.1.2.0/bin/rcov:421
	from /opt/local/lib/ruby/1.8/test/unit.rb:278