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When I buyTokes in browser of dapp, get error .

Uncaught (in promise) Error: Returned error: VM Exception while processing transaction: revert

I am using Windows 10 Home x64
I also posted the same question at Stackoverflow:
https://stackoverflow.com/questions/53312840/how-to-fix-insufficient-funds-for-gas-price-value

This is my truffle.js:
ropsten: { provider: new HDWalletProvider(mnemonic, "https://ropsten.infura.io/"+infura_apikey), network_id: 3, gas: 4000000 },

when I truffle migrate --network ropsten:
it triggers this error:
Running migration: 1_initial-migration.js Deploying Migrations... Error encountered, bailing. Network state unknown. Review successful transactions manually. insufficient funds for gas * price + value

Token migration:

• Deploy n token vesting contracts
• Deploy token
• Transfer tokens to vesting contracts
• Deploy Crowdsale
• Transfer remaning tokens to crowdsale

`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
},`

I am using the following
Truffle v5.0.22 (core: 5.0.22)
Solidity - 0.5.0 (solc-js)
Node v10.16.0
Web3.js v1.0.0-beta.37
openzeppelin-solidity 2.3

while migrating the 2_generic-crowdsale.js I got following error

Transfering Token... Error: Error: Error: Returned error: VM Exception while processing transaction: revert SafeMath: subtraction overflow -- Reason given: SafeMath: subtraction overflow. at Object.run (/usr/lib/node_modules/truffle/build/webpack:/packages/truffle-migrate/index.js:92:1) at process._tickCallback (internal/process/next_tick.js:68:7) Truffle v5.0.22 (core: 5.0.22) Node v10.16.0

Here I am calling the transfer method by converting the amount in string otherwise got the "Error: invalid number value (arg="amount", coderType="uint256", value=2e+25)" erro.

await token.transfer(GenericCrowdsale.address, "20000000000000000000000000", {from: owner});