Failure generating network code. UNetWeaver error

Hello! I recently updated my Unity project to version 2017.4.8f1
Upon opening the project, I receive 69 similar UNetWeaver errors in the console, this being the first one:

UNetWeaver error: parameter [NavMeshObstacle] is of the type [UnityEngine.AI.NavMeshObstacle] is not a valid type, please make sure to use a valid type.

UnityEngine.Debug:LogError(Object)

Unity.UNetWeaver.Log:Error(String) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/Program.cs:20)

Unity.UNetWeaver.Weaver:IsValidTypeToGenerate(TypeDefinition) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:1624)

Unity.UNetWeaver.Weaver:GenerateReadFunction(TypeReference) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:683)

Unity.UNetWeaver.Weaver:GetReadFunc(TypeReference) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:407)

Unity.UNetWeaver.Weaver:GenerateReadFunction(TypeReference) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:750)

Unity.UNetWeaver.Weaver:GetReadFunc(TypeReference) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:407)

Unity.UNetWeaver.Weaver:GenerateReadFunction(TypeReference) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:750)

Unity.UNetWeaver.Weaver:GetReadFunc(TypeReference) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:407)

Unity.UNetWeaver.NetworkBehaviourProcessor:ProcessNetworkReaderParameters(MethodDefinition, ILProcessor, Boolean) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetBehaviourProcessor.cs:1047)

Unity.UNetWeaver.NetworkBehaviourProcessor:ProcessCommandInvoke(MethodDefinition) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetBehaviourProcessor.cs:1101)

Unity.UNetWeaver.NetworkBehaviourProcessor:ProcessMethods() (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetBehaviourProcessor.cs:1677)

Unity.UNetWeaver.NetworkBehaviourProcessor:Process() (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetBehaviourProcessor.cs:58)

Unity.UNetWeaver.Weaver:ProcessNetworkBehaviourType(TypeDefinition) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:1142)

Unity.UNetWeaver.Weaver:CheckNetworkBehaviour(TypeDefinition) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:1681)

Unity.UNetWeaver.Weaver:Weave(String, IEnumerable`1, IAssemblyResolver, String, String, String) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:1791)

Unity.UNetWeaver.Weaver:WeaveAssemblies(IEnumerable`1, IEnumerable`1, IAssemblyResolver, String, String, String) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/UNetWeaver.cs:1888)

Unity.UNetWeaver.Program:Process(String, String, String, String[], String[], IAssemblyResolver, Action`1, Action`1) (at C:/buildslave/unity/build/Extensions/Networking/Weaver/Program.cs:34)

UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface:TickCompilationPipeline(EditorScriptCompilationOptions, BuildTargetGroup, BuildTarget)

I'm not sure what to do or where to begin with this

Also, I'm using the Master Server Framework from the assets store, if at all related.
https://assetstore.unity.com/packages/tools/network/master-server-framework-71391

Any help would be much appreciated. Thank you!