Npm start doesn't work

[CodeWithSubramani]

getting this error on npm start:

[webpack-cli] Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.

• configuration.resolve has an unknown property 'fallback'. These properties are valid:
  object { alias?, aliasFields?, cachePredicate?, cacheWithContext?, concord?, descriptionFiles?, enforceExtension?, enforceModuleExtension?, extensions?, fileSystem?, ignoreRootsErrors?, mainFields?, mainFiles?, moduleExtensions?, modules?, plugins?, preferAbsolute?, resolver?, roots?, symlinks?, unsafeCache?, useSyncFileSystemCalls? }
  -> Options for the resolver
  child_process.js:674
  throw err;
  ^

Error: Command failed: /home/ubuntu/geonode-mapstore-client/geonode_mapstore_client/client/node_modules/.bin/webpack serve --progress --color --port 8081 --hot --inline --config /home/ubuntu/geonode-mapstore-client/geonode_mapstore_client/client/node_modules/@mapstore/project/types/standard/config/webpack.config.js
at checkExecSyncError (child_process.js:635:11)
at Object.execSync (child_process.js:671:15)
at Object. (/home/ubuntu/geonode-mapstore-client/geonode_mapstore_client/client/node_modules/@mapstore/project/scripts/start.js:32:6)
at Module._compile (internal/modules/cjs/loader.js:999:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
at Module.load (internal/modules/cjs/loader.js:863:32)
at Function.Module._load (internal/modules/cjs/loader.js:708:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
at internal/main/run_main_module.js:17:47 {
status: 2,
signal: null,
output: [ null, null, null ],
pid: 8528,
stdout: null,
stderr: null
}
child_process.js:674
throw err;
^

Error: Command failed: node /home/ubuntu/geonode-mapstore-client/geonode_mapstore_client/client/node_modules/@mapstore/project/scripts/start.js --type=standard
at checkExecSyncError (child_process.js:635:11)
at Object.execSync (child_process.js:671:15)
at Object. (/home/ubuntu/geonode-mapstore-client/geonode_mapstore_client/client/node_modules/@mapstore/project/bin/mapstore-project.js:28:10)
at Module._compile (internal/modules/cjs/loader.js:999:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
at Module.load (internal/modules/cjs/loader.js:863:32)
at Function.Module._load (internal/modules/cjs/loader.js:708:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
at internal/main/run_main_module.js:17:47 {
status: 1,
signal: null,
output: [ null, null, null ],
pid: 8520,
stdout: null,
stderr: null
}