OpenError: IO error: /var/lib/explorer/data/LOCK: No such file or directory

[ghost]

ubuntu@ip-172-31-24-88:~/etherchain-light$ npm start

> [email protected] start /home/ubuntu/etherchain-light
> node ./bin/www


events.js:183
      throw er; // Unhandled 'error' event
      ^
OpenError: IO error: /var/lib/explorer/data/LOCK: No such file or directory
    at /home/ubuntu/etherchain-light/node_modules/levelup/lib/levelup.js:117:34
    at /home/ubuntu/etherchain-light/node_modules/leveldown/node_modules/abstract-leveldown/abstract-leveldown.js:39:16
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] start: `node ./bin/www`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/ubuntu/.npm/_logs/2018-05-04T23_18_00_676Z-debug.log