Не удается найти ContentPlaceHolder '<var>X</var>' в шаблоне страницы '<var>Y</var>', проверьте атрибут ContentPlaceHolderID элемента управления содержимым на странице содержимого.

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Cannot find ContentPlaceHolder '<var>X</var>' in the master page '<var>Y</var>', verify content control's ContentPlaceHolderID attribute in the content page.

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