I installed the subversion svn 1.2.3 and tortoise svn 1.6.14 on the server with svnservice according to following link http://www.codeproject.com/KB/architecture/Subversion_on_Windows.aspx
and after this I installed these on client m/c as same .
now when I click on tsvn checkout on client m/c then it gives an error like:
Error: Expected format '3' of repository; found format '5'