Please check on the following places and let us know whether this solution helps or not.

Web.Config file of the project, Please check if following line exists in Web.Config file of your project.

<add assembly="ISNet.WebUI.WebInput, Version=3.0.7200.215, Culture=neutral, PublicKeyToken=B1F2A8511635667A"/>

If it does, please delete the line.

Project bin folder, ISNet.WebUI.WebInput.dll and ISNet.WebUI.WebInput.Resources.dll (only if the project is using register SmartWebResources™) build 215 should be available in the project bin folder. If it doesn’t, please try to add those reference file into the project bin folder.

GAC (Global Assembly Cache, C:\Windows\Assembly), ISNet.WebUI.WebControls.WebInputDesigner.dll and ISNet.WebUI.WebControls.WebInputWizard.dll build 215 should be available in GAC. If it doesn’t, please try to drag and drop them from "C:\Program Files\Intersoft Solutions\WebUI Studio for ASP.NET\WebInput.NET 3.0\Bin" folder into GAC.

Bin folder of WebInput in "C:\Program Files\Intersoft Solutions\WebUI Studio for ASP.NET\WebInput.NET 3.0\Bin", Please ensure that the file version in this folder is up to date.

Hope this helps.

Holger,

In addition to Yudi's suggestion above, you may also want to double check your references and make sure they are updated properly. In this case, ensure that the WebInput assembly in your project's bin folder is already using the latest version (Build 215).