502 Bad Gateway

[OlMi1]

Running the lib/api.js and visiting it (%IP%/api) leads to a 502 bad gateway error. What should I do?

Edit: Starting the api,js as root leads to:

0|api      |     at Module.Hook._require.Module.require (/usr/local/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:80:39)
0|api      |     at require (internal/modules/cjs/helpers.js:25:18)
0|api      |     at Object.<anonymous> (/home/pool/nodejs-pool/node_modules/bitcoinjs-lib/src/payments/p2pkh.js:4:17)
0|api      | TypeError: Object.fromEntries is not a function
0|api      |     at Object.<anonymous> (/home/pool/nodejs-pool/node_modules/bitcoinjs-lib/src/crypto.js:49:37)
0|api      |     at Module._compile (internal/modules/cjs/loader.js:778:30)
0|api      |     at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
0|api      |     at Module.load (internal/modules/cjs/loader.js:653:32)
0|api      |     at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
0|api      |     at Function.Module._load (internal/modules/cjs/loader.js:585:3)
0|api      |     at Module.require (internal/modules/cjs/loader.js:692:17)
0|api      |     at Module.Hook._require.Module.require (/usr/local/lib/node_modules/pm2/node_modules/require-in-the-middle/index.js:80:39)
0|api      |     at require (internal/modules/cjs/helpers.js:25:18)
0|api      |     at Object.<anonymous> (/home/pool/nodejs-pool/node_modules/bitcoinjs-lib/src/payments/p2pkh.js:4:17)