Iussue With building for Web Player

Hi,

I am currently trying to change a PC build to a web build and I am coming across some issues.

Mid way threw my build It kicks me out and I have two errors that I haven’t come across and have struggled to fine similar online, these errors are :

Error building Player: Extracting referenced dlls failed.

ArgumentException: The Assembly System.Configuration is referenced by System.Data (‘Assets/M+WCore/net20/System.Data.dll’). But the dll is not allowed to be included or could not be found.UnityEditor.AssemblyHelper.AddReferencedAssembliesRecurse (System.String assemblyPath, System.Collections.Generic.List1 alreadyFoundAssemblies, System.String[] allAssemblyPaths, System.String[] foldersToSearch, System.Collections.Generic.Dictionary2 cache, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/AssemblyHelper.cs:160)UnityEditor.AssemblyHelper.AddReferencedAssembliesRecurse (System.String assemblyPath, System.Collections.Generic.List1 alreadyFoundAssemblies, System.String[] allAssemblyPaths, System.String[] foldersToSearch, System.Collections.Generic.Dictionary2 cache, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/AssemblyHelper.cs:166)UnityEditor.AssemblyHelper.FindAssembliesReferencedBy (System.String paths, System.String foldersToSearch, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/AssemblyHelper.cs:198)UnityEditor.HostView:OnGUI()

It seems you are using any plugin that is not supported by the webplayer
it has a dll file in it .
It happens when you use inapp purchase or any other plugin .