Expression Error: The Type specified wasn't recognized. Dataflow Cust Function

[Anonymous]

Good Day, I created a function in PBI Desktop Query Editor. and it works fine to process the files. Then I copied this function in a Dataflow which was okay. but when I invoke the function in the dataflow to add a New column, and pass the required input which is binary content; I get this error. I tried googling but couldn;t find anything useful. 
Would really appreciate if anyone can advise how to fix this.

[lbendlin]

what type did you specify?  Please show the relevant bits of your Power Query code.

[Anonymous]

Hi, here's the power query code:

(Filebinary as binary) as table=>

let
Source = Excel.Workbook(Filebinary),

#"Cost_Sheet" = Source{[Item="Cost Info",Kind="Sheet"]}[Data],

#"Removed Top Rows" = Table.Skip(#"Cash_Sheet",91),

#"Removed Other Columns" = Table.SelectColumns(#"Removed Top Rows",{"Column2", "Column3", "Column4", "Column5", "Column6", "Column7"}),

#"Kept Range of Rows" = Table.Range(#"Removed Other Columns",0,3),

#"Promoted Headers" = Table.PromoteHeaders(#"Kept Range of Rows", [PromoteAllScalars=true]),

in
#"Promoted Headers"

[lbendlin · Accepted solution]

try without the "as table"  part

(Filebinary) =>

[Anonymous]

many thanks @lbendlin The trick worked in Dataflow.