I updated mt C# WinForms solution to 20.4.0.43. I updated the license key. The solution builds and runs without error.
The Syncfusion Troubleshooter does not find any issues.
When I try to open the Winforms designer, I get the following errors:
- Object reference not set to instance of an object. The callstack is below.
at
Syncfusion.Windows.Forms.Tools.Design.RibbonControlAdvDesigner.UpdateNestedContainer()
at
Syncfusion.Windows.Forms.Tools.Design.RibbonControlAdvDesigner.Initialize(IComponent
component)
at
System.ComponentModel.Design.DesignerHost.AddToContainerPostProcess(IComponent
component, String name, IContainer containerToAddTo)
at
System.ComponentModel.Design.DesignerHost.PerformAdd(IComponent component,
String name)
at
System.ComponentModel.Design.DesignerHost.System.ComponentModel.Design.IDesignerHost.CreateComponent(Type
componentType, String name)
at
System.ComponentModel.Design.Serialization.DesignerSerializationManager.CreateInstance(Type
type, ICollection arguments, String name, Boolean addToContainer)
at
System.ComponentModel.Design.Serialization.DesignerSerializationManager.System.ComponentModel.Design.Serialization.IDesignerSerializationManager.CreateInstance(Type
type, ICollection arguments, String name, Boolean addToContainer)
at
System.ComponentModel.Design.Serialization.ComponentCodeDomSerializer.DeserializeInstance(IDesignerSerializationManager
manager, Type type, Object[] parameters, String name, Boolean
addToContainer)
at
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager
manager, String name, CodeExpression expression)
at
System.ComponentModel.Design.Serialization.CodeDomSerializer.DeserializeStatementToInstance(IDesignerSerializationManager
manager, CodeStatement statement)
at
System.ComponentModel.Design.Serialization.CodeDomSerializer.Deserialize(IDesignerSerializationManager
manager, Object codeObject)
at
System.Windows.Forms.Design.ControlCodeDomSerializer.Deserialize(IDesignerSerializationManager
manager, Object codeObject)
at
System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.DeserializeName(IDesignerSerializationManager
manager, String name, CodeStatementCollection statements) | | |
- The variable ribbon was either undeclared or was never assigned.
this.Controls.Add(this.ribbon);
