Event Not working Properly on Before Record Saved.

Hi,



I'm trying to add data from landing page with FirstName and LastName. I saw a good tutorial on the community but it is not working for me.



First I checked the event for LeadSaving

Second, I added the an Event Sub Process base on the tutorial I was following.

Then when I'm either adding new or editing exiting Lead, it doesn't save and throws error on UpdateQuery network request with no proper error message (502).



Is there something wrong with what I setup?



Thank you!

Solem A.