OpenAI API Error V1 instead of V2

Hi everyone
am trying to set up an OpenAI API module. What I need is to delete a file from Vector Store. I followed this page https://platform.openai.com/docs/api-reference/vector-stores-files/deleteFile
However, the module results in an error.

RuntimeError
[400] You must provide the ‘OpenAI-Beta’ header to access the Assistants API. Please try again by setting the header ‘OpenAI-Beta: assistants=v2’.

This is my setup:

How can I fix this?
Thank you