ASP.Net Error: The OLE DB provider for linked server does not contain the table Sheet1$

Hello,

I used this example to import data from Excel to SQL Server 

https://www.aspsnippets.com/Articles/How-to-import-data-from-Excel-to-SQL-Server-2008-using-ASPNet.aspx

but I get the following error:

The OLE DB provider "Microsoft.ACE.OLEDB.12.0" for linked server "(null)" does not contain the table "Sheet1$". The table either does not exist or the current user does not have permissions on that table.

I tried all the solutions given in the article plus when I execute the stored procedure on the SQL Server, the command is succesfully executed and the data are imported.

Any ideas what might  be going wrong?

Thank you in advance.