InternalCompilerError when I import a new Facebook 5.1 SDK into my existing project

Question

If I import this package into a new project, I get no problems.

But when I try to import it into my existing project (which had SDK version 5.0.4), after the import is complete, I get the following error message:

Unhandled Exception: Mono.CSharp.InternalErrorException: Internal error

  at Mono.CSharp.MethodGroupExpr.IsApplicable (Mono.CSharp.ResolveContext ec, Mono.CSharp.Arguments& arguments, Int32 arg_count, System.Reflection.MethodBase& method, System.Boolean& params_expanded_form) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.MethodGroupExpr.OverloadResolve (Mono.CSharp.ResolveContext ec, Mono.CSharp.Arguments& Arguments, Boolean may_fail, Location loc) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Invocation.DoResolveOverload (Mono.CSharp.ResolveContext ec) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Invocation.DoResolve (Mono.CSharp.ResolveContext ec) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Expression.Resolve (Mono.CSharp.ResolveContext ec, ResolveFlags flags) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Expression.Resolve (Mono.CSharp.ResolveContext ec) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.ExpressionStatement.ResolveStatement (Mono.CSharp.BlockContext ec) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.StatementExpression.Resolve (Mono.CSharp.BlockContext ec) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.Block.Resolve (Mono.CSharp.BlockContext ec) [0x00000] in <filename unknown>:0 

  at Mono.CSharp.ToplevelBlock.Resolve (Mono.CSharp.FlowBranching parent, Mono.CSharp.BlockContext rc, Mono.CSharp.ParametersCompiled ip, IMethodData md) [0x00000] in <filename unknown>:0 

Does anyone know why this is happening?

(As additional information, in my project I have Itween and EasyTouch integrated)

Answer 1

, - Facebook, , FB.AppRequest, FacebookSDK. .

, , , , .

Answer 2

Unity . FB.AppRequest() :

        FB.AppRequest("WHAT UP?" //message
            , null //to
            , "" //filters
            , null //excludeIds
            , null //maxRecipients
            , "" //data
            , "ASKING YOU" //title
            , myCallback //callback
            );