Are you importing the file as such
Gustavo (Gus) Guimaraes

I solved the problem by using the absolute import path
like this:
import ‘/Users/johnhsu/node_modules/zeppelin-solidity/contracts/token/MintableToken.sol’;

intead of import ‘zeppelin-solidity/contracts/token/MintableToken.sol’

the truffle migrate also goes well, but
now I have a problem on deploy, the deploy seem success but failed running:
JCoinCrowdsale.deployed().then(inst => { crowdsale = inst })

please see the stackoverflow link:

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