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Item has already been added. Key in dictionary: '1' Key being added: '1'?

Hi,

why am I getting this exception?

Item has already been added. Key in dictionary: '1' Key being added: '1'

regards

rale

btw. This exception is thrown on

Workbook.Save(fileName, FileFormatType.Excel2007Xlsx);

Hi,

Please try the attached latest version/fix v4.8.2.1.

If you still find the issue, kindly do post your sample code (with template file(s) or sample application if you have) to reproduce the issue, we will check it soon.

Thank you.