This is a bug in IIFL APIs. This was already reported by our team to IIFL & they mentioned that they have applied a fix for it.
However, we do see this error pop up every now & then.
Solution
Please report this to IIFL API team [apisupport.broking@iifl.com].
This needs a fix on the broker’s side. There is not much we can do from our side.