502 bad gateaway nginx

Hello, i have been getting bad gateaway error in my MERN application. with pm2 logs, i have these errors:

/root/.pm2/logs/server-error.log last 15 lines:
0|server   |     at Module.load (internal/modules/cjs/loader.js:928:32)
0|server   |     at Function.Module._load (internal/modules/cjs/loader.js:769:14)
0|server   |     at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
0|server   |     at internal/main/run_main_module.js:17:47
0|server   | Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /root/GottaGetGamesWeb/backend/server.js
0|server   |     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1080:13)
0|server   |     at Module.load (internal/modules/cjs/loader.js:928:32)
0|server   |     at Function.Module._load (internal/modules/cjs/loader.js:769:14)
0|server   |     at Object.<anonymous> (/root/.nvm/versions/node/v14.15.5/lib/node_modules/pm2/lib/ProcessContainerFork.js:48:21)
0|server   |     at Module._compile (internal/modules/cjs/loader.js:1063:30)
0|server   |     at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
0|server   |     at Module.load (internal/modules/cjs/loader.js:928:32)
0|server   |     at Function.Module._load (internal/modules/cjs/loader.js:769:14)
0|server   |     at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
0|server   |     at internal/main/run_main_module.js:17:47

please help me.