I am getting an error when i click new webpart in webpart gallery. I want to deploy my custom webpart to sharepoint webpart gallery. I try to look in sharepoint log. Sadly, there is no further info in sharepoint log. They dont even throw correlation number error.
Are you using smart-part in your SharePoint site? If so, maybe you should install AJAX 1.0 in your web front-end server to solve that error. This is a common error when you dealing with smart-part. If not, just ignore my answer.