Cannot have different trial period intervals and/or frequencies

{
  "error": {
    "type": "request_error",
    "code": "transaction_price_different_trial_period",
    "detail": "You are attempting to create a transaction with prices that have differing trial period intervals and/or frequencies",
    "documentation_url": "https://developer.paddle.com/errors/transactions/transaction_price_different_trial_period",
    "errors": [
      {
        "field": "items.price.trial_period",
        "message": "cannot have different trial period intervals and/or frequencies"
      }
    ]
  },
  "meta": {
    "request_id": "00000000-0000-0000-0000-000000000000"
  }
}