We cannot convert a value of type Record to type Function.

Hi,

I have created a function to call Activity events REST api to get user activity for the last 30 days. FOe Bearer Access token i have created another function. Here is the code -

Get Access Token 

Function is working fine and generating bearer access token as shown 

Now to get User Activity data using Activity events api i have created a list of dates and two custom columns for startdate and enddate as 

Now i have created another function GetActivity to call REST API as - 

Now i am adding a custom column in a query to generate the list of user activity data by making a call of this custom function as

In the above snap it is clear that Get Activity function is calling Get Access token function inside to get the Bearer access token and it is picking up the startdate and enddate from the columns defined above , Noiw it should a list activity as shown -

But in my case it is showing this error -

Can anyone help my out to resolve this . I am following Bi Elite video to crteate an admin panel -

This is the link of video 

https://www.youtube.com/watch?v=Z4E2jSZ4r6A&list=PLL-WSn9hvefogtxxi7CJhjLCJvrDY0mpQ&index=4

and this is the link of the M code  - 

https://bielite.com/blog/building-a-power-bi-admin-report/

Thanks in advance