文件格式与当前目标框架不兼容。若要转换文件格式，请显式保存文件。在保存文件并重新打开设计器之后，此错误将会消失。

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The file format is not compatible with current targeting framework. To convert the file format, please explicitly save the file. This error message will go away after you save the file and reopen the designer.

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