Using a LIST in Column Header/ Expand Table

[Tom_Y]

This code is working, and generate the table I need. But when I replace {"Project", "SURVEY DATE", "Measure", "Count"} by {ListOfColumns} then it fails. Can anyone help? Thank you very much.

let
    Source = #"List of Project",
    #"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),
    #"Expanded Column1" = Table.ExpandTableColumn(#"Converted to Table", "Column1", {"Project", "SURVEY DATE", "Measure", "Count"}, {"Project", "SURVEY DATE", "Measure", "Count"})
in
    #"Expanded Column1"

This is the query for ListOfColumns and it's working on its own.

let
    Source = {"Project", "SURVEY DATE", "Measure", "Count"}
in
    Source

[Tom_Y]

Wow, magical!

[AlienSx · Accepted solution]

@Tom_Y don't use curly brackets. Plain ListOfColumns should work.