C:Usersacertest>truffle migrate --reset --network ropsten
Using network 'ropsten'.

Running migration: 1_initial_migration.js
  Deploying Migrations...
  ... 0xf9d9daf3c904e239bc27fd70a51916e1dd954238215f631e7f341e1270fa55ab
Error: Invalid JSON RPC response: ""
    at Object.InvalidResponse (C:Usersacertestnode_modulesweb3libweb3errors.js:35:16)
    at XMLHttpRequest.request.onreadystatechange (C:Usersacertestnode_modulesweb3libweb3httpprovider.js:115:32)
    at XMLHttpRequest.dispatchEvent (C:Usersacertestnode_modulesxhr2libxhr2.js:76:20)
    at XMLHttpRequest._setReadyState (C:Usersacertestnode_modulesxhr2libxhr2.js:422:14)
    at XMLHttpRequest._onHttpRequestError (C:Usersacertestnode_modulesxhr2libxhr2.js:669:14)
    at ClientRequest.request.on (C:Usersacertestnode_modulesxhr2libxhr2.js:499:23)
    at ClientRequest.emit (events.js:182:13)
    at TLSSocket.socketErrorListener (_http_client.js:391:9)
    at TLSSocket.emit (events.js:182:13)
    at emitErrorNT (internal/streams/destroy.js:82:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
    at process._tickCallback (internal/process/next_tick.js:63:19)
  Migrations: 0x116940816fb03041b4fc9018dffdef346fe0932b
Saving artifacts...
Running migration: 2_migration.js
  Replacing DinarCoin...
  ... 0x8b1ddbc08abb3561be6df6148a7a5cf9006e1e6ae520dd9e8a67713ed6af33cd
  DinarCoin: 0xeb43d979ec0d3d004c5d50c202e2cbec02edf2e1
Saving artifacts...
  Deploying DinarCrowdsale...
  ... 0x949fff0717b07829fd62f5df0fb9f21ad1ed2d4b9665704c75aab206fcf49921
Error: Invalid JSON RPC response: ""
    at Object.InvalidResponse (C:Usersacertestnode_modulesweb3libweb3errors.js:35:16)