First install truffle npm install -g truffle, once installed, download and installed ganache(MacOS my case), run ganache and select the "Quickstart" button.
After that, go to the folder directory ./lib/contract_linking.dart and replace the private key and set the _rpcUrl and wsUrl with your own, and later go to the root directory to find the truffle-config.js and set the host property with same value as the _wsUrl and _rpcUrl.
Runs truffle migrate and later flutter run, just wait until compiling is done and compare with the preview below
