Symptom:
When installing ZeeControls, Visual Web Developer Express 2008 was activated and the following message box was prompted:
Package Load Failure
Package 'Toolbox Control Installer Package' has failed to load properly (GUID = {...}). Please contact package vendor for assistance. Application restart is recommended, due to possible environment corruption. Would you like to disable loading this package in the future? You may use 'VWDExpress /resetskippkgs' to re-enable package loading.
Please click OK to dismiss the message box, quit Visual Web Developer Express 2008, and allow the ZeeControls installer to complete.
Cause and fix:
MS ASP.NET AJAX Extensions 1.0 was not installed. This prevented the installer from adding items to Visual Studio toolbox.
Update (2009/4/1): Starting from version 2.1, ZeeControls is distributed in 3 editions. One of them requires MS ASP.NET AJAX 1.0. Please review our installation guide to choose the right edition.
MS ASP.NET AJAX Extensions 1.0 can be downloaded from:
http://go.microsoft.com/fwlink/?LinkID=77296.
After MS ASP.NET AJAX Extensions 1.0 was installed, please re-run ZeeControls installer. There is no need to un-install ZeeControls first.