How to fetch data page by page from API

Hi Team,

Im very new to power query and API and unable to figure a way out from this fetching data from API which returns 10 rows per call.

Below is how my code looks like which i got it from some other post and modified for the my requirement.  its giving me error as provided in the image below. Can any one please please help me how i can deal with it.

let
BaseUrl = "https://webexapis.com/v1/meetings?meetingType=meeting&from=2019-01-22T04:00:00Z&to=2020-12-31T04:00:00Z",
Token = "blahblahblah",
EntitiesPerPage = 10,

GetJson = (Url) =>
let
Options = [Headers=[ #"Authorization" = "Bearer " & Token ]],
RawData = Web.Contents(Url, Options),
Json = Json.Document(RawData)
in Json,

GetEntityCount = () =>
let Url = BaseUrl & "$count=true&$top=0",
Json = GetJson(Url),
Count = Json[#"@odata.count"]
in Count,

GetPage = (Index) =>
let Skip = "$skip=" & Text.From(Index * EntitiesPerPage),
Top = "$top=" & Text.From(EntitiesPerPage),
Url = BaseUrl & Skip & "&" & Top,
Json = GetJson(Url),
Value = Json[#"value"]
in Value,

EntityCount = List.Max({ EntitiesPerPage, GetEntityCount() }),
PageCount = Number.RoundUp(EntityCount / EntitiesPerPage),
PageIndices = { 0 .. PageCount - 1 },
Pages = List.Transform(PageIndices, each GetPage(_)),
Entities = List.Union(Pages),
Table = Table.FromList(Entities, Splitter.SplitByNothing(), null, null, ExtraValues.Error)
in
Table

Error :