AYUDAAA URGENTEEE!!!

Buenos días, quisiera saber a qué se deberá un error que dice:

"One or more errors encountered while loading the designer.The errors are
listed below. Some errors can be fixed by rebuilding your project, while
others may require code changes. Clicking on each error will take you to the
line of code that caused it.

Object reference not set to an instance of an object."

y aparece luego lo que supongo que ocasionó el error



at System.Data.UniqueConstraint.GetHashCode()
at System.Collections.Hashtable.GetHash(Object key)
at System.Collections.Hashtable.get_Item(Object key)
at
System.ComponentModel.Design.Serialization.DesignerSerializationManager.System.ComponentModel.Design.Serialization.IDesignerSerializationManager.GetName(Object value)
at
System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializePropertiesFromResources(IDesignerSerializationManager
manager, Object value, Attribute[] filter)
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.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager
manager, String name, CodeExpression expression)



PUEDO CORREGIR ESTO O TENGO QUE HACER EL FORM NUEVAMENTE?

Gracias por la ayuda



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