with splash screen not starting up

expo start results in the following error:

````
Failed building JavaScript bundle.
Unable to resolve module @unimodules/core from /Users/bharat/Dev/animatedSplash/examples/with-splash-screen/node_modules/expo/build/Expo.fx.js: @unimodules/core could not be found within the project or in these directories:
node_modules

If you are sure the module exists, try these steps:
1. Clear watchman watches: watchman watch-del-all
2. Delete node_modules and run yarn install
3. Reset Metro's cache: yarn start --reset-cache
4. Remove the cache: rm -rf /tmp/metro-*
> 1 | import './environment/validate.fx';
2 | // load remote logging for compatibility with custom development clients
3 | import './environment/logging.fx';
4 | import './environment/react-native-logs.fx';
Error: Problems validating fields in app.json. Learn more: https://docs.expo.io/workflow/configuration/
• should NOT have additional property 'projectRoot'.
• should NOT have additional property 'staticConfigPath'.
• should NOT have additional property 'packageJsonPath'.
• should NOT have additional property 'config’.
```

**To Reproduce**
Steps to reproduce the behavior:

npm i
expo start