Im getting this error from calling a webhook when testing my automation

[Darwish]

Hi everybody,

So im building an inventory management app and one of the feature is the available stock in the inventory will be automatically updated when im adding a stock from another table and release a stock from another different table. right now im following the step to do the above from a youtube i found , but when i do the steps to do that im getting this error that i cannot understand

this is the youtube im following right now: https://www.youtube.com/watch?v=IKqm5OzyLZQ&t=1938s

if its cannot be solve, can anybody suggest an idea how to do what i want to make

[scott192]

Can you show us the body template code of the webhook?  Copy/Paste as text rather than screenshot?