IL2051: Property element does not have required argument name in custom attribute annotations file

Cause

A property element in a custom attribute annotations file does not specify the required argument name.

Example

<!-- IL2051: Property element does not contain attribute 'name' -->
<linker>
  <assembly fullname="MyAssembly">
    <type fullname="MyType">
      <attribute fullname="MyAttribute">
        <property>UnspecifiedPropertyName</property>
      </attribute>
    </type>
  </assembly>
</linker>