Cannot access parameter value in "On Page Load" Custom Action

Hi,

I am using a custom action in "On Page Load" where it should be getting a JSON parameter from the previous screen as an argument and do some calculations based on that
But it wont get any values from the parameter and page fails on load, where as other widgets I have on the screen are taking values from assigned JSON path and instantiate the value

I have also tried using a "Local Page State Variable" and tried to use a "Update Page State" to update that field first thing in "On Page Load" and then use the value of that field as the argument in the next action, still no luck

Please help

Thanks,
Hamid