I got the same issue. I updated my ANDROID_HOME env variable again it worked for me.
Follow this React-native android-setup documentation
ex:
export ANDROID_HOME=~/Library/Android/sdk
Windows:
set ANDROID_HOME=c:/Users/whoever/AppData/Local/Android/Sdk
macOS Mojave and earlier or bash users:
1 – Open your bash profile:
open .bash_profile
Add this to your bash_profile:
export ANDROID_SDK=/Users/<your_computer_name>/Library/Android/sdk
export PATH=/Users/<your_computer_name>/Library/Android/sdk/platform-tools:$PATH
Save and close
Compile your changes
source ~/.bash_profile
For macOS Catalina and zsh users:
Starting with macOS Catalina, your Mac uses zsh as the default login shell and interactive shell. You can make zsh the default in earlier versions of macOS as well.
On your Mac:
Open your .zshrc file:
open ~/.zshrc
If .zshrc file not exist, you need to create one using touch & open.
touch ~/.zshrc
Add this to your .zshrc file
export ANDROID_SDK=/Users/<your_computer_name>/Library/Android/sdk
export PATH=/Users/<your_computer_name>/Library/Android/sdk/platform-tools:$PATH
Save and close
Compile your changes
source ~/.zshrc
Edit: Updated answer for macOS Catalina and zsh users.