Creating custom activity

Hi,

I'm trying to implement a custom activity. I have come few questions but there were no solid answers on the same.

From my end,

1. I was able to duplicate an activity input form

2. Extended xtk.workflow schema to get the activity element.

3. Able to see the activity created in Flow control tab.

But when I ran the workflow, it gave me below error

Can anyone please let me know if there is a way to implement custom activity?

@_manoj_kumar_ 

@vraghav 

Thanks,

Krishnakanth