Message in Japanese (日本語)
同じデータ コントラクト名 '<var>Y</var>:X' を持つ別の型 '<var>X</var>' が既に存在するため、型 '<var>Type Name</var>' を既知の型のリストに追加できません。
Unlocalized message
Type '<var>Type Name</var>' cannot be added to list of known types since another type '<var>X</var>' with the same data contract name '<var>Y</var>:X' is already present. If there are different collections of a particular type - for example, List<test> and Test[], they cannot both be added as known types. Consider specifying only one of these types for addition to the known types list.</test>
Search by Google