How to use the error function from log4js

triangular-arbitrage.js

GitHub: ego-cogitare/cryptomate-wss

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                logger.info(`equalizer completed for - ${initialQuote}`);
                this.getClient().getEqualizer().releaseChannel(initialQuote);
            }
        })
        .catch((e) => {
            logger.error(`equalizer error - ${e.message}`);
            this.getClient().getEqualizer().releaseChannel(initialQuote);
        });
    }
}

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garbage-seller.js

GitHub: ego-cogitare/cryptomate-wss

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        marketsToSell[possibleMarket] = {
            price: sellPrice,
            amount: balance,
        };
    } catch (e) {
        logger.error(e.message);
    }
}

/** If there is no markets where shit coin can be sold */

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+ 3 other calls in file

proxy.js

GitHub: MissRaunak/Projectgis.github.io

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} else {
  res.send('support get and post only.');
}
if(r){
  r.on('error', function(err){
    logger.error('proxy error', err);
  });
  // r.on('response', function(response) {
  //   console.log(response.statusCode); // 200
  //   console.log(response.headers['content-type']); // 'image/png'

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+ 4 other calls in file