checkout svn://xxx@xxx/svnrepos/repository/trunk -r HEAD --depth=infinity --force
The working copy needs to be upgraded
svn: Working copy 'some\path' is too old (format 10, created by Subversion 1.6)
The working copy needs to be upgraded
svn: Working copy 'some\path' is too old (format 10, created by Subversion 1.6)
If so, I'll help you fix this problem.
Solution
Delete the old folders in the file explorer (usually located in the left-hand side of your workspace) in Eclipse. Now your file explorer should be empty. Import the SVN project from the new SVN server again by right-clicking and selecting "Import... -> SVN". The error should go away.
In my case I use the PHP Explorer. In your case it may be another type of project explorer. It depends on which explorer you are using in Eclipse.
Questions? Let me know!