problem with building project

I am making an MMORPG since a few days, and I already have my main menu with a login screen

Today I started to make a C# script to connect my project to a MSSQL database, and I got it to work also

But my problem is that in only works in the editor, when I try to build this project it says that I need to import System.EnterpriseServices.dll as well because it can't be found...

I imported that dll as wel, and then I needed to import System.EnterpriceServices.Thunk.dll

When I did that and try to build again I got these two errors (with stack trace)

NullReferenceException: Object reference not set to an instance of an object Mono.Cecil.StructureReader.VisitModuleDefinitionCo llection (Mono.Cecil.ModuleDefinitionCollection modules) Rethrow as ReflectionException: Can not read module : System.EnterpriseServices.Thunk.dll Mono.Cecil.StructureReader.VisitModuleDefinitionCo llection (Mono.Cecil.ModuleDefinitionCollection modules) Mono.Cecil.ModuleDefinitionCollection.Accept (IReflectionStructureVisitor visitor) Mono.Cecil.AssemblyDefinition.Accept (IReflectionStructureVisitor visitor) Mono.Cecil.AssemblyFactory.GetAssembly (Mono.Cecil.Binary.ImageReader irv, Boolean manifestOnly) Mono.Cecil.AssemblyFactory.GetAssemblyManifest (Mono.Cecil.Binary.ImageReader reader) Mono.Cecil.AssemblyFactory.GetAssemblyManifest (System.String file) UnityEditor.AssemblyHelper.GetAssemblyDefinitionCa ched (System.String path, System.Collections.Generic.Dictionary`2 cache) (at C:/BuildAgent/work/b0bcff80449a48aa/Editor/Mono/AssemblyHelper.cs:47) UnityEditor.AssemblyHelper.FindAssemblyName (System.String fullName, System.String name, System.String[] allAssemblyPaths, System.String[] foldersToSearch, System.Collections.Generic.Dictionary`2 cache) (at C:/BuildAgent/work/b0bcff80449a48aa/Editor/Mono/AssemblyHelper.cs:85) UnityEditor.AssemblyHelper.AddReferencedAssemblies Recurse (System.String assemblyPath, System.Collections.Generic.List`1 alreadyFoundAssemblies, System.String[] allAssemblyPaths, System.String[] foldersToSearch, System.Collections.Generic.Dictionary`2 cache) (at C:/BuildAgent/work/b0bcff80449a48aa/Editor/Mono/AssemblyHelper.cs:69) UnityEditor.AssemblyHelper.FindAssembliesReference dBy (System.String[] paths, System.String[] foldersToSearch) (at C:/BuildAgent/work/b0bcff80449a48aa/Editor/Mono/AssemblyHelper.cs:107) UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()

AND

Error building Player: Extracting referenced dlls failed.

Is there anybody who has an idea of what I am doing wrong? Or someone who can tell me an alternative way of connecting to MSSQL server directly?