Package uses conflict: Import-Package on startup of a bundle

I am getting the following error when trying to install the htmlunit bundle:

com.springsource.com.gargoylesoftware.htmlunit_2.6.0 [370] could not be resolved.
  Reason: Package uses conflict: 
  Import-Package: org.apache.commons.logging.impl; version="1.1.1"

I have followed the diagnostic procedure for this type of problem on this blog.

And here are my findings: The bundle com.springsource.com.gargoylesoftware.htmlunit_2.6.0 has the following instructions:

Import-Package: \
  org.apache.commons.logging;version="[1.1.1, 2.0.0)",\
  org.apache.commons.logging.impl;version="[1.1.1, 2.0.0)"

The only bundle that has this in its use constraint in my OSGi is com.springsource.org.apache.commons.logging, which has these instructions:

Export-Package: \
  org.apache.commons.logging;version="1.1.1",\
  org.apache.commons.logging.impl;version="1.1.1";\
    uses:="javax.servlet,
           org.apache.avalon.framework.logger,
           org.apache.commons.logging,
           org.apache.log,
           org.apache.log4j"

Import-Package: \
  javax.servlet;version="[2.1.0, 3.0.0)";resolution:=optional,\
  org.apache.avalon.framework.logger;version="[4.1.3, 4.1.3]";resolution:=optional,\
  org.apache.log;version="[1.0.1, 1.0.1]";resolution:=optional,\
  org.apache.log4j;version="[1.2.15, 2.0.0)";resolution:=optional   

At this point I am stuck as I can't figure out what the problem is and how to resolve it although from what I provided above it should be clear, but not to me :(

Any ideas...?