Strange validation error : 'verticalDpi has invalid value '0'

Hello

OpenXmlValidator class has thrown strange error like the title for my ordinary Excel .xslx file which works well with Excel application. Error type is 'Schema'. The file is created with Excel application, not programatically. The file had had no error with earlier validator of openXml SDK 1.0. Can anyone help me on this?

One more maybe wrong error from schema part.

On my legal .xlsx document I see

sheetFomatPr x:dyDescent=0.4 ...
row x:dyDescent=0.4

Now the new OpenXmlValidator class again throws an error,

"The *:dyDescent attribute is not declared..."

I give up the new validator class for now.