PrecompiledAssemblyException: **Multiple precompiled assemblies with the same name Newtonsoft.Json.dll included or the current platform. Only one assembly with the same name is allowed per platform**. Assembly paths:
Assets/JsonDotNet/Assemblies/Standalone/Newtonsoft.Json.dll
Assets/Plugins/QuickSheet/GDataPlugin/Editor/Google/Newtonsoft.Json.dll
UnityEditor.Scripting.ScriptCompilation.PrecompiledAssemblyProvider.ValidateAndGetNameToPrecompiledAssembly (UnityEditor.Scripting.ScriptCompilation.PrecDirtyPrecompiledAssembliesompiledAssembly[] precompiledAssemblies) (at /Users/bokken/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/PrecompiledAssembly.cs:118)
UnityEditor.Scripting.ScriptCompilation.PrecompiledAssemblyProvider.GetPrecompiledAssembliesDictionary (System.Boolean isEditor, UnityEditor.BuildTargetGroup buildTargetGroup, UnityEditor.BuildTarget buildTarget) (at /Users/bokken/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/PrecompiledAssembly.cs:63)
UnityEditor.Scripting.ScriptCompilation.PrecompiledAssemblyProvider.GetPrecompiledAssemblies (System.Boolean isEditor, UnityEditor.BuildTargetGroup buildTargetGroup, UnityEditor.BuildTarget buildTarget) (at /Users/bokken/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/PrecompiledAssembly.cs:52)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.DirtyPrecompiledAssembly (System.String path) (at /Users/bokken/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:440)
UnityEditor.Scripting.ScriptCompilation.EditorCompilation.DirtyPrecompiledAssemblies (System.String[] paths) (at /Users/bokken/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilation.cs:430)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface+<>c__DisplayClass20_0.<DirtyPrecompiledAssemblies>b__0 () (at /Users/bokken/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:188)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface.EmitExceptionAsError (System.Action action) (at /Users/bokken/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:83)
UnityEditor.Scripting.ScriptCompilation.EditorCompilationInterface:DirtyPrecompiledAssemblies(String[]) (at /Users/bokken/buildslave/unity/build/Editor/Mono/Scripting/ScriptCompilation/EditorCompilationInterface.cs:188)