Entity Framework 5.0 and SharePoint 2013

Hello:

I implemented a WCF service which utilizes EF 5.0 to return a custom object with information pulled from database. I deployed this WCF service into ISAPI folder. When I invoke this service, it returns below error:

WCF project is set to .NET Framework 4.5

Error=Could not load file or assembly 'EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.  Server stack trace:     
 at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)    
 at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)    
 at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)    
 at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)    
 at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)    Exception rethrown
 at [0]:     

Do I need to install EF on the server to be able to utilize it? Could you please provide pointers?

Thanks