Thanks, it helped some, but I'm still having an error:

  [1] node:internal/modules/cjs/loader:1368
  [1]   throw err;
  [1]   ^
  [1] 
  [1] Error: Cannot find module '/home/user/shadow/start-backend.js'
  [1]     at Function._resolveFilename (node:internal/modules/cjs/loader:1365:15)
  [1]     at defaultResolveImpl (node:internal/modules/cjs/loader:1021:19)
  [1]     at resolveForCJSWithHooks (node:internal/modules/cjs/loader:1026:22)
  [1]     at Function._load (node:internal/modules/cjs/loader:1175:37)
  [1]     at TracingChannel.traceSync (node:diagnostics_channel:322:14)
  [1]     at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
  [1]     at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:171:5)
  [1]     at node:internal/main/run_main_module:36:49 {
  [1]   code: 'MODULE_NOT_FOUND',
  [1]   requireStack: []
  [1] }