csharpdevelop 打开designer报错，求高手解决

csharpdevelop 打开designer报错，求高手解决：
Failed to load designer. Check the source code for syntax errors and check if all references are available.

ICSharpCode.FormsDesigner.FormsDesignerLoadException: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ComponentModel.LicenseException: Unable to locate license assembly.
   at Infragistics.Shared.UltraLicenseProvider.GetDesignTimeLicense(Type type, Object instance, Boolean allowExceptions, UltraLicenseBaseAttribute licenseAttribute)
   at Infragistics.Shared.UltraLicenseProvider.GetLicense(LicenseContext context, Type type, Object instance, Boolean allowExceptions)
   at System.ComponentModel.LicenseManager.ValidateInternalRecursive(LicenseContext context, Type type, Object instance, Boolean allowExceptions, License& license, String& licenseKey)
   at System.ComponentModel.LicenseManager.Validate(Type type, Object instance)
   at Infragistics.Win.Misc.Utilities.ValidateLicense(Type type, Object instance)
   at Infragistics.Win.Misc.UltraButton..ctor()
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle._InvokeConstructor(IRuntimeMethodInfo method, Object[] args, SignatureStruct& signature, RuntimeType declaringType)
   at System.RuntimeMethodHandle.InvokeConstructor(IRuntimeMethodInfo method, Object[] args, SignatureStruct signature, RuntimeType declaringType)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.SecurityUtils.SecureConstructorInvoke(Type type, Type[] argTypes, Object[] args, Boolean allowNonPublic, BindingFlags extraFlags)
   at System.ComponentModel.ReflectTypeDescriptionProvider.CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, Object[] args)
   at System.ComponentModel.TypeDescriptor.TypeDescriptionNode.CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, Object[] args)
   at System.ComponentModel.TypeDescriptor.CreateInstance(IServiceProvider provider, Type objectType, Type[] argTypes, Object[] args)
   at System.ComponentModel.Design.DesignSurface.CreateInstance(Type type)
   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.CodeDomSerializerBase.DeserializeInstance(IDesignerSerializationManager manager, Type type, Object[] parameters, 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 ICSharpCode.FormsDesigner.Services.ProjectResourcesComponentCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, Object codeObject)
   at System.Windows.Forms.Design.ControlCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, Object codeObject)
   at ICSharpCode.FormsDesigner.Services.ProjectResourcesComponentCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, Object codeObject)
   at System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.DeserializeName(IDesignerSerializationManager manager, String name, CodeStatementCollection statements)

补充：.NET技术 ,  C#