Member Avatar for dejanc

Hello,
I have a big problem with opening asp.net website. I have building asp.net website months. Yesterday I have install a fresh Windows7, and after that install Visual Web Developer 2010 express from which I have build website.
Now when I open webiste in Web Developer, and browse with Internet it wont open. And also in Web Developer getting on each website huge Warnings.
Warnings:
1. D:\Webisite\details.aspx: Asp.net runtime error: Could not load file or assembly ''Xheo.licensing Version= 2,0,3300,0.
2. This name contains uppercase characters, which is not allowed
3. Unrecognized tag prefix or device filter 'asp'.
4. ....
5. ....

On this site I have 7315 Warnings. Please see a picture as attachment.

I'm totaly lost about this.

Thanks in advance for help to anyone.

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  • Latest Post Latest Post by aspproject

Dani AI

Generated

Two separate problems are visible in this thread: the validation/warning flood (case-sensitivity and page validation) that called out, and the fatal runtime failure caused by a missing third‑party assembly (Xheo.Licensing) that tracked down. is also correct in the simple case — if an app uses a third‑party DLL it must be referenced and deployed. Deleting the assembly entry from web.config will stop the immediate parser crash (as found) but can silently remove required functionality or licensing checks, so treat that as a short‑term fix only.

Practical, safe checklist (run in this order):

  1. Locate any real dependency: search the entire solution/files for “Xheo” (Find in Files). Check project References, packages.config and the Bin folder to see whether code or controls actually require that DLL.
  2. If the DLL is required, restore it from the original dev machine or vendor installer and add it as a project reference (Add Reference -> Browse), then set the reference property Copy Local = True so it deploys into Bin. If the DLL had been installed into the GAC on the old PC, install it on the new PC with the vendor installer or gacutil.
  3. Capture the binding failure to be precise: use the Assembly Binding Log Viewer (Fuslogvw.exe) to log bind failures and see exact probing paths and version mismatches — this avoids guessing.
  4. If the DLL is not needed, keep the web.config change but run a full pass through the app to confirm no pages or features rely on it. Keep a backed‑up copy of web.config before editing.
  5. Address the validation warnings and the “unrecognized tag prefix 'asp'” separately: set the correct DOCTYPE or Visual Studio HTML validation target (Tools → Options → Text Editor → HTML → Validation), make sure the site is opened as an ASP.NET Web Site/Web Application (not a loose file), and confirm IIS/AppPool is mapped to the correct .NET version.

Quick cautions: avoid copying unknown DLLs from untrusted sources; prefer vendor installers or original build outputs; keep backups of web.config and use source control so fixes can be reverted if behavior appears later.

Recommended Answers

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Member Avatar for svilla

The Uppercase warnings look like the site was first built using the older HTML standards which allow upper and lower case in the tag names and attributes. Since moving over the it looks as if you are using the XHTML 1.0 standard which does not allow upper case in the tags.

<!-- Valid HTML Code, Not valid for XHTML --->
<H1>Heading</H1>
<DIV CLASS="class1">Inside Div 1 </DIV>

<!-- Valid XHTML Code --->
<h1>Heading</h1>
<div class="class1">Inside Div 1 </div>

Now these are only warnigs so your page should still show. But it is best to fix them and to adhere to the XHTML standards if that is what you are using.

Edited by svilla because: n/a
Member Avatar for dejanc

Hi,
and thank you for reply.

I have install all IIS features.
I have also install all VS tools from installation, and almost all warnings has gone, except one has left
Xheo.Licensing.

I'm suprised that on the web there is no solution for this issue. I have checked a lot posts.

Any idea?


Here is error when try to open my page:

Server Error in '/backup v10' Application.
--------------------------------------------------------------------------------

Configuration Error
Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: Could not load file or assembly 'Xheo.Licensing, Version=2.0.3300.0, Culture=neutral, PublicKeyToken=798276055709c98a' or one of its dependencies. The system cannot find the file specified.

Source Error:


Line 37: <assemblies>
Line 38: <add assembly="System.Management, Version=, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
Line 39: <add assembly="Xheo.Licensing, Version=2.0.3300.0, Culture=neutral, PublicKeyToken=798276055709C98A"/></assemblies></compilation>
Line 40: </system.web>
Line 41: </configuration>


Source File: D:\BACKUP FILES\SPLETNE STRANI\VISUAL STUDIO\Backup\backup v10\web.config Line: 39

Assembly Load Trace: The following information can be helpful to determine why the assembly 'Xheo.Licensing, Version=2.0.3300.0, Culture=neutral, PublicKeyToken=798276055709c98a' 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].


--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

Member Avatar for dejanc

I have found solution also for Xheo.Licensing. I still do not know how it appear in my web.config code, but I have just delete entire assembly code.

Member Avatar for aspproject

R u using any third party dll in your project...if yes then give reference to this dll in your project....It will work

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