When i try to connect slack with n8n by client ID and secret, It gives me this error. How do i solve this?

Hey guys. I was executing a workflow which basically generate an apollo URL, get apollo leads through ampleleads. But in my case it is not getting leads, the status is appearing as "processing". I manually checked in ampleleads, it was working fine. It keeps getting stuck on "If" node because of the status. I attached some files so you get an idea of what i am saying.

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