Below is the error log I recieved from Ionic Pro output.
* What went wrong: A problem occurred configuring root project 'android'. > Failed to install the following SDK components: [Android SDK Platform 26] The SDK directory (/opt/android-sdk) is not writeable, please update the directory permissions. * Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Failed to upload apk to storage please retry your build. Running after script... $ clean-up Cleaning up files... Successful clean up ERROR: Job failed: exit status 1