The cache client assemblies are a different version than the cache host assemblies.
Assembly: Microsoft.ApplicationServer.Caching.Core (in Microsoft.ApplicationServer.Caching.Core.dll)
It is important that your application or development environment use the same assemblies as the cache servers. During any upgrade of AppFabric, make sure that all cache clients using the cache cluster have the same versions of assemblies. Check this by comparing the Product version of the cache client's Microsoft.ApplicationServer.Caching.Client.dll file with the Product version of the cache server's Microsoft.ApplicationServer.Caching.Server.dll file located in the AppFabric installation directory.