"Please specify a valid card." error when creating subscription

"Please specify a valid card." error when creating subscription

When i try to create a subscription using API, with starting date in past, i get following error:

Request:
POST /subscriptions
[
  "customer_id" => "xxxxxxx"
  "plan" => array:1 [
    "plan_code" => "xxxxx"
  ]
  "starts_at" => "2020-12-06"
]

Response:
{"code":8006,"message":"Please specify a valid card."}

Why do I get this error ?
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