build problems with publishedapi javadoc target

[Daniel John Debrunner]

I'm seeing build errors trying to build the javadoc target, 
publishedapi. I'm using ant 1.6.2. Any ideas?

BUILD FAILED
C:\_work\svn_linq\trunk\build.xml:597: The following error occurred 
while executing this line:
C:\_work\svn_linq\trunk\build.xml:608: The following error occurred 
while executing this line:
C:\_work\svn_linq\trunk\build.xml:674: The <javadoc> type doesn't 
support the "executable" attribute.

Dan.