Module build failed: Error: Cannot find module 'neo-async'

This error message indicates that the module 'neo-async' is missing and cannot be found in your project's dependencies.

To resolve this issue, you can try the following steps:

1. Make sure that you have installed 'neo-async' module in your project. You can install it using npm by running the command:

npm install neo-async

2. If you have already installed 'neo-async' module, then check if it is listed in your project's package.json file under dependencies. If not, you can manually add it by running the command:

npm install neo-async --save

3. If the above steps do not work, try deleting the 'node_modules' folder and reinstalling all the dependencies by running the command:

npm install

This should resolve the issue and allow you to build your project successfully.