Error: We Cannot Convert a value of Type Function to Type list


Board Regular
I have been trying to create a function to calculate the number of working days (including holidays). I found instructions on how to create fnNetworkdays but I am getting the following error when I try to use it in a query:

Expression.Error: We cannot convert a value of type Function to type List.

I have no clue what it means. Here is my M coding for the function:

(StartDate as date, EndDate as date) as number =>
Source = List.Dates,
#"Invoked Function Source" =
if StartDate <= EndDate then
Source(StartDate,Duration.Days(EndDate-StartDate)+1, Duration.From(1))
Source(EndDate, Duration.Days(StartDate-EndDate)+1, Duration.From(1)),
#"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
#"Inserted Day of Week" = Table.AddColumn(#"Converted to Table", "Day of Week", each Date.DayOfWeek([Column1],Day.Monday), Int64.Type),
#"Filtered Rows" = Table.SelectRows(#"Inserted Day of Week", each ([Day of Week] <> 5 and [Day of Week] <> 6)),
Custom1 = if StartDate <= EndDate then Table.RowCount(#"Filtered Rows") else Table.RowCount(#"Filtered Rows")*(-1)

Can anyone see where I am going wrong? This is the instructions I followed:


Board Regular
I've had this problem before and it was because you were using a table instead of a list.
Click on the query column heading and select drill down.


Board Regular
Shouldn't the line

#"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),

Actually be:
#"Converted to Table" = Table.FromList(#"Invoked Function Source", Splitter.SplitByNothing(), null, null, ExtraValues.Error),

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