title: I have added Spire.Doc from NuGet, but now getting run-time error?
body: <p>i am try to implement Spire.Doc, but getting run-time error:</p>
  
  <p><strong>Could not load file or assembly 'Spire.Doc' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)</strong></p>
  
  <p><strong>Stack Trace:</strong> </p>
  
  <pre><code>[FileLoadException: Could not load file or assembly 'Spire.Doc' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)]
  
  [FileLoadException: Could not load file or assembly 'Spire.Doc, Version=6.9.11.4040, Culture=neutral, PublicKeyToken=663f351905198cb3' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)]
     System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +0
     System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +36
     System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +152
     System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark&amp; stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection) +77
     System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark&amp; stackMark, Boolean forIntrospection) +21
     System.Reflection.Assembly.Load(String assemblyString) +28
     System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +38
  
  [ConfigurationErrorsException: Could not load file or assembly 'Spire.Doc, Version=6.9.11.4040, Culture=neutral, PublicKeyToken=663f351905198cb3' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)]
     System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +738
     System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +217
     System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +130
     System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +170
     System.Web.Compilation.BuildManager.GetPreStartInitMethodsFromReferencedAssemblies() +92
     System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath, Boolean&amp; isRefAssemblyLoaded) +290
     System.Web.Compilation.BuildManager.ExecutePreAppStart() +157
     System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +549
  
  [HttpException (0x80004005): Could not load file or assembly 'Spire.Doc, Version=6.9.11.4040, Culture=neutral, PublicKeyToken=663f351905198cb3' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)]
     System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +10074760
     System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +95
     System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +254
  </code></pre>