Error message : Failed to install the following Android SDK packages as some licenses have not been accepted.

This is kine of normal issue for early stage development of mobile app using React-Native. Follow the step below to resolve this issue by accepted all the required licenses.

For windows users :

On your command prompt (CMD), point the directrory to your SDK folder

cd $ANDROID_HOME/tools/bin

next insert this command

sdkmanager --licenses

you need to enter letter ‘Y’ to accept all the required licenses.

After all required licenses has been accepted, rebuild your app.

Other Reference : stackoverflow.com