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I'm running a truffle project and have imported OpenZeppelin contracts.

While running truffle compile I'm facing following error:

github.com/OpenZeppelin/openzeppelin-solidity/contracts/crowdsale/Crowdsale.sol:4:1: 
ParserError: Source "github.com/OpenZeppelin/openzeppelin-solidity/contracts/math/SafeMath.sol" not found: 
File import callback not supported 
import "../math/SafeMath.sol"; 
^----------------------------^

How can I work around this issue?

It will be great if someone could help me understand what this error says.

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the question is old but I'll answer it anyway,

if you use VS Code add

 "solidity.packageDefaultDependenciesContractsDirectory": "",
 "solidity.packageDefaultDependenciesDirectory": "node_modules"

in it's settings.json

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