Webparts errors

•  Unable to display this Web Part" on Data Views after restoring site from backup
• “The name ‘InitializeControl’ does not exist in the current context”- Visual Web part
• InitializeControl doesn't exist
• Error Occurred in Deployment step 'Recycle IIS Application Pool'
• Recycle IIS Application Pool’: 0x80070005 Access denied 
• Error handling in web part
• Web Part Error: Access denied. You do not have permission to perform this action or access this resource' with some correlation ID.'
• Webparts doesnt show up in webpart gallery, what might be the reason
• A Web Part or Web Form Control on this Page cannot be displayed or imported. The type could not be found or it is not registered as safe.