Error: assertion failure with message: The taker marketplace is not a valid marketplace

[lurk24]

I am trying to interact with the contract on wax and receiving this error:
Error: assertion failure with message: The taker marketplace is not a valid marketplace

The transaction was setup like this:

let txnAct1 = {
  "account":"atomicmarket",
  "name":"assertsale",
  "authorization":[
    {
    "actor": actor,
    "permission": permission
    }
  ],
  "data":{
    "sale_id": sale.sale_id,
    "asset_ids_to_assert": assetsToBuy,
    "listing_price_to_assert":formatToken(sale.price.amount, sale.price.token_precision)+' '+sale.price.token_symbol,
    "settlement_symbol_to_assert":sale.price.token_precision+','+sale.price.token_symbol
    }
  }
let txnAct2 = {
  "account":"eosio.token",
  "name":"transfer",
  "authorization":[
    {
      "actor": actor,
      "permission": permission
    }
  ],
  "data": {
  "from": actor,
  "to":"atomicmarket",
  "quantity": formatToken(sale.price.amount, sale.price.token_precision)+' '+sale.price.token_symbol,
  "memo":"deposit"
  }
}
let txnAct3 = {
"account":"atomicmarket",
"name":"purchasesale",
"authorization":[
    {
    "actor":actor,
    "permission":permission
    }
  ],
"data":{
  "buyer":actor,
  "sale_id":sale.sale_id,
  "intended_delphi_median":0,
  "taker_marketplace":"waxstats1111"
  }
}
transactionData = {
  'actions': [txnAct1, txnAct2, txnAct3],
}

I am trying to specify a taker_marketplace which seems to be the problem... I thought this was as simple as specifying any valid account, for example: waxstats1111 -- If this is wrong, what is needed to become a valid marketplace?

[jamesonsite]

use regmarket action with atomicmarket