When I run ionic build android command in root of ionic project, I am getting this error:
FAILURE: Build failed with an exception.
The solution for this question is here https://docops.ca.com/devtest-solutions/8-0-2/en/installing/setting-up-the-mobile-testing-environment/preinstallation-steps-for-mobile-testing/
Please follow this steps, and solve your problem.
The Android SDK package contains a component called compile tools. The mobile test requires at least version 19.0.1, 19.1.0 or 20.0.0.
If these versions are not installed with your ADT package, you may receive an error message when creating a mobile asset in the DevTest Workstation: