Putty error trying to Proxy SSH thru SOCK5 proxy: Proxy returned Unexpected Version - any help?

"Are you sure your proxy is a SOCKS-5 proxy. The error message you are getting is telling you that Putty is expecting the proxy version to be 5 and that the proxy is returning an incorrect version (not 5).

If you can interpret a bit of code you can see exactly what's happening by looking at the Putty proxy code and a quick look at the SOCKS protocol."