@RAFFY, I'm finding I get the same error when I try to create an IFTTT applet. I confirmed I haven't changed any code on my end. I'm looking into it. Thank you for reporting this problem!
EDIT: I got a response from IFTTT that wasn't very helpful. I sent them another email and I'm still waiting.
Basically, right now you can't create new IFTTT applets that use ingredients in the params field.
For now, you could use the old Webhooks method.
EDIT2: It's fixed now.