Could not load file or assembly 'Microsoft.ReportViewer.WebForms' or one of its dependencies. Strong name signature could not be verified.

Struxureware Power Monitoring 7.0.1 installed in a distributed environment with Reporting Services on the database server. The following error occurs in Web Reporter when the Reports tab is selected (other tabs function properly):

Server Error in '/reporter' Application.

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Could not load file or assembly 'Microsoft.ReportViewer.WebForms' or one of its dependencies. Strong name signature could not be verified. The assembly may have been tampered with, or it was delay signed but not fully signed with the correct private key. (Exception from HRESULT: 0x80131045)

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.FileLoadException: Could not load file or assembly 'Microsoft.ReportViewer.WebForms' or one of its dependencies. Strong name signature could not be verified. The assembly may have been tampered with, or it was delay signed but not fully signed with the correct private key. (Exception from HRESULT: 0x80131045)

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Assembly Load Trace: The following information can be helpful to determine why the assembly 'Microsoft.ReportViewer.WebForms' could not be loaded.

WRN: Assembly binding logging is turned OFF.

To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.

Note: There is some performance penalty associated with assembly bind failure logging.

To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

Stack Trace:

[FileLoadException: Could not load file or assembly 'Microsoft.ReportViewer.WebForms' or one of its dependencies. Strong name signature could not be verified. The assembly may have been tampered with, or it was delay signed but not fully signed with the correct private key. (Exception from HRESULT: 0x80131045)]

[FileLoadException: Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Strong name signature could not be verified. The assembly may have been tampered with, or it was delay signed but not fully signed with the correct private key. (Exception from HRESULT: 0x80131045)]

System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +0

System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +39

System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection, Boolean suppressSecurityChecks) +132

System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +144

System.Reflection.Assembly.Load(String assemblyString) +28

System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +46

[ConfigurationErrorsException: Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Strong name signature could not be verified. The assembly may have been tampered with, or it was delay signed but not fully signed with the correct private key. (Exception from HRESULT: 0x80131045)]

System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +618

System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +209

System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +130

System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +178

System.Web.Compilation.BuildManager.GetPreStartInitMethodsFromReferencedAssemblies() +94

System.Web.Compilation.BuildManager.CallPreStartInitMethods() +332

System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +677

[HttpException (0x80004005): Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Strong name signature could not be verified. The assembly may have been tampered with, or it was delay signed but not fully signed with the correct private key. (Exception from HRESULT: 0x80131045)]

System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9104104

System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +97

System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +258

The following ReportViewer Controls should be installed on the application server during the installation but did not get installed:

Microsoft.ReportViewer.Common
Microsoft.ReportViewer.ProcessingObjectModel
Microsoft.ReportViewer.WebForms
Microsoft.ReportViewer.WinForms

For more information about the controls refer to:
http://msdn.microsoft.com/en-us/library/ms251723(v=vs.90).aspx

The problem was resolved by running the installer with 'run as administrator' option. After correction the files exist in C:\Windows\assembly folder:




NOTE: The above files exist on the database server as well and get installed during Reporting Services installation.