Gem question; error on list -r

[Patrick Gundlach]

Hi,

I've put my gem command into an unusable state:

~$ gem list --r

*** REMOTE GEMS ***
Bulk updating Gem source index for: http://gems.rubyforge.org
ERROR: While executing gem ... (NoMethodError)
private method `scan' called for #<YAML:rivateType:0x3849600>

I've previously removed source_cache, with source_cache in place, I get
the following

*** REMOTE GEMS ***
Need to update 2 gems from http://gems.rubyforge.org
ERROR: While executing gem ... (URI::InvalidURIError)
bad URI(is not URI?):
http://gems.rubyforge.org/quick/activerecord-jdbc-#<gem::version:0xa53ac84>.gemspec.rz

Could anybody point me to a solution?

TIA,
Patrick