praveenc63682930
I would suggest to disable enhanced experience composer while creating an activity on this page. This can be done in 2 ways as below
1. Disable EEC for the account, before creating the activity.
Go to Setup > Disable Enhanced experienced composer from the toggle button
This would not modify anything for the existing activities, rather any new activity would be created with EEC OFF
2. You can also disable EEC for the specific activity.
Once you receive this error, click on the gear button and go to 'Page Delivery' > diable EEC from the toggle button and SAVE
Click next and Save the activity again.
This should help you to load the page within Target VEC. Let me know if that helps.