i have no idea how to fix this error and really need help ITS A BIG ERROR

okay well i could use any help right now and im really want it to be easy to fix

[ Internal compiler error. See the console log for more information. output was:
Unhandled Exception: Mono.CSharp.InternalErrorException: Assets/Photon Unity Networking/Plugins/PhotonNetwork/SocketUdp.cs(28,16): ExitGames.Client.Photon.SocketUdp.SocketUdp(ExitGames.Client.Photon.PeerBase) ---> System.TypeLoadException: Could not load type 'System.Runtime.Versioning.TargetFrameworkAttribute' from assembly 'Photon3Unity3D'.

at (wrapper managed-to-native) System.MonoCustomAttrs:GetCustomAttributesInternal (System.Reflection.ICustomAttributeProvider,System.Type,bool)

at System.MonoCustomAttrs.GetCustomAttributesBase (ICustomAttributeProvider obj, System.Type attributeType) [0x00000] in <filename unknown>:0

at System.MonoCustomAttrs.GetCustomAttributes (ICustomAttributeProvider obj, System.Type attributeType, Boolean inherit) [0x00000] in <filename unknown>:0

at System.Reflection.Assembly.GetCustomAttributes (System.Type attributeType, Boolean inherit) [0x00000] in <filename unknown>:0

at Mono.CSharp.TypeManager.IsThisOrFriendAssembly (System.Reflection.Assembly assembly) [0x00000] in <filename unknown>:0

at Mono.CSharp.Expression.IsAccessorAccessible (System.Type invocation_type, System.Reflection.MethodInfo mi, System.Boolean& must_do_cs1540_check) [0x00000] in <filename unknown>:0

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

at Mono.CSharp.MemberAccess.DoResolve (Mono.CSharp.ResolveContext ec, Mono.CSharp.Expression right_side) [0x00000] in <filename unknown>:0

at Mono.CSharp.MemberAccess.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.MemberAccess.DoResolve (Mono.CSharp.ResolveContext ec, Mono.CSharp.Expression right_side) [0x00000] in <filename unknown>:0

at Mono.CSharp.MemberAccess.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.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.If.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

--- End of inner exception stack trace ---

at Mono.CSharp.TypeContainer.EmitConstructors () [0x00000] in <filename unknown>:0

at Mono.CSharp.TypeContainer.EmitType () [0x00000] in <filename unknown>:0

at Mono.CSharp.RootContext.EmitCode () [0x00000] in <filename unknown>:0

at Mono.CSharp.Driver.Compile () [0x00000] in <filename unknown>:0

at Mono.CSharp.Driver.Main (System.String[] args) [0x00000] in <filename unknown>:0 ]

 

You need to set the .NET Compatibility in the player settings to a different subset.

 

im not sure what you Mean

 

can you give me more Detail Im really Not good at the scripting thing

 

http://docs.unity3d.com/Manual/class-PlayerSettings.html

Use .NET 2.0 instead of .NET 2.0 subset in API Compatibility Level

 

OO i think i got it

 

okay how to i make it .NET 2.0
sorry if im being Hard to work with

 

Edit>Project Settings>Player

It's under Other Settings in the inspector pane

 

okay so how do i make it a .NET 2.0 like where do i get to the API at?

 

It's a dropdown, just set it to .NET 2.0

 

that didn't work

 

i have it set to NET 2.0 nothing

 

Usually an issue with importing an assembly comes down to that. As we can tell now that isn't the case. Have you tried importing Photon into a blank project?

 

yeah and it works if i have Photon on its own Project at first now i tried putting it on my main Project and i can't get it to work

 

this is what i watched to get this far
yeah i Used his Project from EP 10 and fixed all the Errors then i hit this one and couldn't
get this one to work

 

so do you know what to do?

 

Hey Bro you got Anymore Ideas?