Created Unassigned: Variable Datatype [9341]

I am using vb.net as my language and I am having a difficulty determining the correct datatype for some of the examples given, especially the variable for data with ranges. From what I am seeing is that the declaration of the example is just var <variablename>, I am trying to insert data table starting from a specific cell..using the code

rangewithdata = worksheet.Cell(9, 1).InsertTable(ds.Tables(0).AsEnumerable)

from these two topic
https://closedxml.codeplex.com/wikipage?title=Inserting%20Data&referringTitle=Documentation
https://closedxml.codeplex.com/wikipage?title=Inserting%20Tables&referringTitle=Documentation

I want to use insertData but I can't that is why I am trying to use insertTable but still can't it gives me this error

Unable to cast object of type 'ClosedXML.Excel.XLTable' to type 'ClosedXML.Excel.IXLRanges'.

I declare rangewithdata as IXLRanges as to I really don't know what would be the datatype of it in vb.net, hope someone helps me with this..