I am trying to create a crowdsale contract using zeppelin. But i am facing following errors.

CrowdSale.sol:6:46: DeclarationError: Identifier not found or not unique.
contract EdCoinCrowdSale is CappedCrowdSale, RefundableCrowdSale {
CrowdSale.sol:24:51: DeclarationError: Undeclared identifier.
    function setCrowdsaleStage(uint value) public onlyOwner {

I have imported contract using import.

import "node_modules/zeppelin-solidity/contracts/crowdsale/distribution/RefundableCrowdSale.sol";

I have looked at other solutions but i am still facing above mentioned errors.

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