TypeError: Cannot read properties of undefined (reading 'addChild')

[ahsan2000]

I am just trying to use functions in my main class but whenever I call the function from another page this error shows on the terminal.
is there any way to achieve my goal? just want to create resources on other pages and call them in the main class.
this is the main class page:

this is the resources page:

the output:

[ahsan2000]

sorry i cant delete it but it was my mistake not passing data in function that is why that was happening

[github-actions[bot]]

Hello! Reopening this discussion to make it searchable.