Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. - General Questions https://solidcp.com/forum/question/could-not-load-file-or-assembly-microsoft-bcl-asyncinterfaces-or-one-of-its-dependencies-the-located-assemblys-manifest-definition-does-not-match-the-assembly-reference/ SolidCP Discussion Board en-US Fri, 16 Oct 2026 12:24:02 +0000 wpForo 60 RE: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. https://solidcp.com/forum/question/could-not-load-file-or-assembly-microsoft-bcl-asyncinterfaces-or-one-of-its-dependencies-the-located-assemblys-manifest-definition-does-not-match-the-assembly-reference/#post-10817 Fri, 07 Nov 2025 00:15:14 +0000 Found out it was the same issue as 

There is bug when Exchange 2019 CU15 gets installed – Page 2 – General Questions – SolidCP Forum

The work around worked.

]]> General Questions mastercodefu https://solidcp.com/forum/question/could-not-load-file-or-assembly-microsoft-bcl-asyncinterfaces-or-one-of-its-dependencies-the-located-assemblys-manifest-definition-does-not-match-the-assembly-reference/#post-10817 RE: Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. https://solidcp.com/forum/question/could-not-load-file-or-assembly-microsoft-bcl-asyncinterfaces-or-one-of-its-dependencies-the-located-assemblys-manifest-definition-does-not-match-the-assembly-reference/#post-10816 Tue, 04 Nov 2025 16:59:52 +0000 Any help on this as is annoying. I have even removed it and installed the 1.5.1 again on the device but same error.

]]> General Questions mastercodefu https://solidcp.com/forum/question/could-not-load-file-or-assembly-microsoft-bcl-asyncinterfaces-or-one-of-its-dependencies-the-located-assemblys-manifest-definition-does-not-match-the-assembly-reference/#post-10816 Could not load file or assembly 'Microsoft.Bcl.AsyncInterfaces' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. https://solidcp.com/forum/question/could-not-load-file-or-assembly-microsoft-bcl-asyncinterfaces-or-one-of-its-dependencies-the-located-assemblys-manifest-definition-does-not-match-the-assembly-reference/#post-10813 Mon, 03 Nov 2025 01:34:56 +0000 


   System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +0
   System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +232
   System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection) +113
   System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +23
   System.Reflection.Assembly.Load(String assemblyString) +35
   System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +49


   System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +762
   System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +259
   System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +167
   System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +238
   System.Web.Compilation.BuildManager.GetPreStartInitMethodsFromReferencedAssemblies() +78
   System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath, Boolean& isRefAssemblyLoaded) +334
   System.Web.Compilation.BuildManager.ExecutePreAppStart() +178
   System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +746


   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +552
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +122
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +732
]]> General Questions mastercodefu https://solidcp.com/forum/question/could-not-load-file-or-assembly-microsoft-bcl-asyncinterfaces-or-one-of-its-dependencies-the-located-assemblys-manifest-definition-does-not-match-the-assembly-reference/#post-10813