System.ArgumentOutOfRangeException: 'Index was out of range.

[hafizullah.ozgur]

This morning it was working properly but right now it is popping up the below error, this is my code:
Spire.Xls.Workbook workbook = new Spire.Xls.Workbook();
Spire.Xls.Worksheet sheet = workbook.Worksheets[10];

error
System.ArgumentOutOfRangeException: 'Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index'

[Betsy.jiang]

Hi,

Thanks for your inquiry.
Please provide the input Excel file which has the issue for further investigation.

Sincerely,
Betsy
E-iceblue support team

[Betsy.jiang]

Hi,

Hope you are doing well.
Has your issue been resolved? If not, please provide your input file for further investigation.

Sincerely,
Betsy
E-iceblue support team