Could not load file or assembly '2017-12-31 19-00 Copy of AjaxControlToolkit' or one of its dependencies - .net-assembly

Question

I have some issued in my exchange mail server 2013. After i login it's showing as below description. Please help me to solve this problem. Thanks.
Server Error in '/ecp' Application.
Could not load file or assembly '2017-12-31 19-00 Copy of
AjaxControlToolkit' or one of its dependencies. The located assembly's
manifest definition does not match the assembly reference. (Exception
from HRESULT: 0x80131040) 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 '2017-12-31 19-00 Copy of AjaxControlToolkit' or one of
its dependencies. The located assembly's manifest definition does not
match the assembly reference. (Exception from HRESULT: 0x80131040)
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 '2017-12-31 19-00 Copy of
AjaxControlToolkit' 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 '2017-12-31 19-00
Copy of AjaxControlToolkit' 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& 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) +210
System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString,
Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr
pPrivHostBinder, Boolean forIntrospection) +242
System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString,
Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean
forIntrospection) +17 System.Reflection.Assembly.Load(String
assemblyString) +35
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String
assemblyName, Boolean starDirective) +122
[ConfigurationErrorsException: Could not load file or assembly
'2017-12-31 19-00 Copy of AjaxControlToolkit' 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) [phone]
System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory()
+503 System.Web.Configuration.AssemblyInfo.get_AssemblyInternal() +142 System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection
compConfig) +334
System.Web.Compilation.BuildManager.CallPreStartInitMethods(String
preStartInitListPath) +203
System.Web.Compilation.BuildManager.ExecutePreAppStart() +152
System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager
appManager, IApplicationHost appHost, IConfigMapPathFactory
configMapPathFactory, HostingEnvironmentParameters hostingParameters,
PolicyLevel policyLevel, Exception appDomainCreationException) +1151
[HttpException (0x80004005): Could not load file or assembly
'2017-12-31 19-00 Copy of AjaxControlToolkit' 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) [phone]
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context)
+159 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest
wr, HttpContext context) [phone]

Answer 1

This problem has solved. I deleted the files name
2017-12-31 19-00 Copy of AjaxControlToolkit.dll
2017-12-31 19-00 Copy of Microsoft.Exchange.Management.ControlPanel.dll
2017-12-31 19-00 Copy of Microsoft.Exchange.Management.ControlPanel.OwaOptionStrings.dll
2017-12-31 19-00 Copy of Microsoft.Exchange.Management.ControlPanelMsg.dll
2017-12-31 19-00 Copy of Microsoft.Exchange.PowerShell.RbacHostingTools.dll
2017-12-31 19-00 Copy of Microsoft.Online.BOX.Shell.dll
2017-12-31 19-00 Copy of Microsoft.PowerShell.HostingTools.dll
2017-12-31 19-00 Copy of Web.config
From folder below:
D:\Microsoft\Exchange Server\V15\ClientAccess\ecp\bin
So it's work automatic. If you got error like that but display similar please try to delete (Copy to another folder, in case of problem we need recovery)that file from another folder.
Thanks!!!