In the data contract name for type '{1}', there are curly braces with '{0}' inside, which is an invalid value. Curly braces ...

In the data contract name for type '{1}', there are curly braces with '{0}' inside, which is an invalid value. Curly braces have special meaning in data contract names - they are used to customize the naming of data contracts for generic types. Based on the number of generic parameters this type has, the contents of the curly braces must either be a number between 0 and '{2}' to insert the name of the generic parameter at that index or the '#' symbol to insert a digest of the generic parameter namespaces.