Как решить Error: Mode must be «sandbox» or «live»?

Error: Mode must be "sandbox" or "live"
    at Object.configure (/var/www/html/сайт/node_modules/paypal-rest-sdk/lib/api.js:26:15)
    at Object.configure (/var/www/html/сайт/node_modules/paypal-rest-sdk/lib/paypal-rest-sdk.js:10:13)
    at Object.PayPalConfig [as default] (/var/www/html/сайт/dist-server/server/service/payments-systems/paypal/config.js:5:12)
    at new PaypalPayment (/var/www/html/сайт/dist-server/server/service/payments-systems/paypal/payment.js:50:25)
    at new PricingController (/var/www/html/сайт/dist-server/server/controller/pricing/pricing.controller.js:54:30)
    at new PricingRoute (/var/www/html/сайт/dist-server/server/routes/pricing.route.js:61:27)
    at Object.<anonymous> (/var/www/html/сайт/dist-server/server/routes/pricing.route.js:236:19)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function._load (/usr/lib/node_modules/pm2/node_modules/@pm2/io/build/main/metrics/httpMetrics.js:172:43)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/var/www/html/сайт/dist-server/server/app.js:24:23)