'i have an error on access database no value given for one or more parameters

   'sql = "select * from tblProduct Order by ProductID"
       Sql = "SELECT tblProduct.PID, tblProduct.ProductID, tblProduct.ProductName, tblProduct.SubcategoryID, tblProduct.Description, tblProduct.CostPrice, tblProduct.SellingPrice, tblProduct.Discount, tblProduct.VAT, tblProduct.OpeningStock, tblProduct.Pic FROM tbSubcategory INNER JOIN tblProduct ON tbSubcategory.SubcategoryID = tblProduct.SubcategoryID"
        .CursorType = adOpenDynamic
        .CursorLocation = adUseClient
        .LockType = adLockOptimistic
        .Open Sql, cn, , adCmdText


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