SharePoint Designer 2010 Workflow Error: Could not deserialize object. The type could not be resolved

In development environment I have SharePoint Workflow created in SharePoint Designer. This workflow using custom activity created in Visual Studio. After deplo开发者_如何学编程yment web (Import-SPWeb Export-SPWeb) in production i've got error when tring to open my worklow within Designer.

Could not deserialize object. The type 'MyTypeHere' could not be resolved.

I've trying to reinstall solution and clear SharePoint Designer cache in application data. In workflow's xoml i specify right full namespace of my assembly with custom activity and this assembly exist in GAC.

Problem solved. I could not figure out how, but works fine now. 100% server was not restarted. May be it is because farm configuration and web.configs. Use feature activation to be sure that you control .config files.