I have the following errors in the log.  I get the same error for each page on the site as I'm getting for the page called forum which is the error below.  Any ideas?

AssemblyVersion: 04.05.01
PortalID: 0
PortalName: website
UserID: -1
UserName:
ActiveTabID: 36
ActiveTabName: Welcome
RawURL: /path/ScriptResource.axd?d=qlmG0zj9cwE27uB7unfAXz-MX3ysp-KguXlbKeT4_klWHi1U3AaPzz7R0nSyooJVxe92X--h03F8QaX3zeThn-z3FvSyv4c90&t=633120873440937500
AbsoluteURL: /path/ScriptResource.axd
AbsoluteURLReferrer: http://www.path/Forum/tabid/53/Default.aspx
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; (R1 1.5); .NET CLR 1.1.4322; .NET CLR 2.0.50727)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: b4e1eeaf-a959-47e2-9de9-773915a410ad
InnerException: Unhandled Error:
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Web.HttpNotFoundHandler.ProcessRequest
StackTrace:
Message: System.Exception: Unhandled Error: ---> System.Web.HttpException: Path '/path/ScriptResource.axd' was not found. at System.Web.HttpNotFoundHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) --- End of inner exception stack trace ---
Source:
Server Name: DEDI514

I did find this dll in the bin, thank you the following fixed the problem but now I have two new error:

The following fixed the problem:

 I was having the same event error... I fixed with the following:

however now I get 2 new errors about every hour:

1.)AssemblyVersion: -1
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL:
AbsoluteURL:
AbsoluteURLReferrer:
UserAgent:
DefaultDataProvider:
ExceptionGUID:
InnerException: Value cannot be null. Parameter name: type
FileName:
FileLineNumber: -1
FileColumnNumber: -1
Method:
StackTrace:
Message: System.ArgumentNullException: Value cannot be null. Parameter name: type at System.Activator.CreateInstance(Type type, Boolean nonPublic) at DotNetNuke.Framework.Reflection.CreateObject(String TypeName, String CacheKey) at DotNetNuke.Services.Search.ModuleIndexer.GetModuleList(Int32 PortalID)
Source:
Server Name: DEDI514

2.)AssemblyVersion: -1
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL:
AbsoluteURL:
AbsoluteURLReferrer:
UserAgent:
DefaultDataProvider:
ExceptionGUID:
InnerException: Could not load type ''.
FileName:
FileLineNumber: -1
FileColumnNumber: -1
Method:
StackTrace:
Message: System.Web.HttpException: Could not load type ''. ---> System.ArgumentException: String cannot have zero length. at System.Reflection.Assembly.GetType(String name, Boolean throwOnError, Boolean ignoreCase) at System.Web.Compilation.BuildManager.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) --- End of inner exception stack trace --- at System.Web.Compilation.BuildManager.GetType(String typeName, Boolean throwOnError, Boolean ignoreCase) at DotNetNuke.Framework.Reflection.CreateType(String TypeName, String CacheKey, Boolean UseCache, Boolean IgnoreErrors)
Source:
Server Name: DEDI514

I did some looking around the forums and in one case that was a bit similar it was mentioned that 4.5.1 has a bit more configuraitons in the web.config file.

I took the web.config file out of the 4.5.1 full install package (that isn't included in the Upgrade) and modifed it to match the database info as well as (and most importantly, the <machineKey validationKey=) information in the 4.3.7 version I was running.

I replaced the web.config with this new copy and VIOLA the error is gone.

Note, if you don't copy over teh machinekey info you will loose access to all the users because the passwords are linked to this.

Declic The original error was solved by downloading the install version of DNN 4.5.1 to get the config.web file and changing the db strings and the keys the upgrade version did not have a config file so I didn't think I needed to change it.

 However after changing the config file I then got new errors as listed above for about two days.  Then after two days of these errors every 30 minutes log viewer I was no longer able to log into the site as anyone not host, admin or any user.  I had to run a script to change the password of the host to log into the site.  I then had to manuall reset all users passwords including admin so that users could log in.  I am still getting the last two errors in the error log of the DNN4.5.1 every 30 minutes.