Error encountered, bailing. Network state unknown. Review successful transactions manually. replacement transaction underpriced

[kennblvnp]

`sh-3.2# truffle migrate --network ropsten
Using network 'ropsten'.

Running migration: 4_multi-beneficiary-token-vesting.js
Running step...
Replacing SimpleToken...
... 0xc62f6eedb5e3da6663766ac2d0e8b53075e912b500e33e0dfd7affacd869c496
SimpleToken: 0xd2d686b16e0a98a3ef1cbb7d43b3e0960250e139
Deploying MultiBeneficiaryTokenVesting...
... 0x23b5025fe52df23aec97bc3009cefb2eb3725d51d48741b63b79952a04642b78
MultiBeneficiaryTokenVesting: 0x951db468c290f0651ac105062e2f3e4618b379de
... 0xa64ca323a5b42164cc2ebf78e1dea594a414f206d4c46ad6f70e0cac9fdf4ada
Deploying GenericCrowdsale...
... 0xc681a75dfe274109e5f895322d7cb9daa4291428d19d0687f8cfe970e3a2f877
Error encountered, bailing. Network state unknown. Review successful transactions manually.
replacement transaction underpriced`

`ropsten: {
  provider: new HDWalletProvider(MNEMONIC, "https://ropsten.infura.io/R34FZKF26EAVJSIX9UKMBQVP7A5493Z18M"),
  network_id: 3,
  // from: "0xEf4a847BDE8341336bFB97FbDc1B642B9bCA242C",
  gas: 4800000
},`