设计器报错 ：值不能为null，参数名：instance

max5295

安装vs2019后安装smobiler4.6，打开以前的项目，报错，然后卸载，然后安装5.1，仍旧报错，请问如何解决

重启vs试试

遇到同样的问题

Lula.Jin 发表于 2020-5-14 13:23
重启vs试试

值不能为 null。参数名: instance ，是版本的问题吗
此错误的实例(1)  

1.   隐藏调用堆栈

在 System.ComponentModel.TypeDescriptor.AddAttributes(Object instance, Attribute[] attributes)
在 Microsoft.VisualStudio.Design.VSDesignSurface.CreateDesigner(IComponent component, Boolean rootDesigner)
在 System.ComponentModel.Design.DesignerHost.AddToContainerPostProcess(IComponent component, String name, IContainer containerToAddTo)
在 System.ComponentModel.Design.DesignerHost.PerformAdd(IComponent component, String name)
在 System.ComponentModel.Design.DesignerHost.System.ComponentModel.Design.IDesignerHost.CreateComponent(Type componentType, String name)
在 System.ComponentModel.Design.Serialization.DesignerSerializationManager.CreateInstance(Type type, ICollection arguments, String name, Boolean addToContainer)
在 System.ComponentModel.Design.Serialization.DesignerSerializationManager.System.ComponentModel.Design.Serialization.IDesignerSerializationManager.CreateInstance(Type type, ICollection arguments, String name, Boolean addToContainer)
在 System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, CodeTypeDeclaration declaration)
在 System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
在 Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
--- 引发异常的上一位置中堆栈跟踪的末尾 ---
在 Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
在 Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.DeferredLoadHandler.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32 fReload)  

解决了吗？
我遇到同样问题 ，重启没有啊