RE: Error: version does not match the server version
The issue is that the client and server have a mismatched build number (from different cumulative updates, even though both may be NAV 2013).
Have you recently deployed a Cumulative Update (platform, i.e. the files portion; or application, i.e. the NAV code objects portion)?
Since the client version is showing blank in the error, you can try to find the client build by locating and right clicking the NAV client file, then clickin on Properties > Details to see what version and build number it shows in the File Version and Product Version properties.
Not sure where the NAV client file is located? You can right click the shortcut and look at the properties; typically it is located in "C:\Program Files (x86)\Microsoft Dynamics NAV\70\RoleTailored Client\" and the file is called Microsoft.Dynamics.Nav.Client.exe (the person installing NAV on your server may have installed it on a different drive or folder).
I hope this helps. If my response has answered your question, please verify by clicking Yes next to "Did this answer your question?"