Issue with SVN download

I am trying to download the Spark code so I can make a small change and then push it out to our internal users…

I tried the instructions which say to use:

svn co spark

When I use TortoiseSVN from a command prompt, I get:

C:\SparkCode>svn co spark

svn: Invalid config: unknown HTTP library '


Sooooo, what am I doing wrong???