[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project MobiquityProject: Compilation failure -> [Help 1]

Build Environment
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1

This is my first time experience of running a project on CircleCI. I deployed my project on GitHub. I have ran this project severally locally and it runs fine. I decided to use CirCleCI for continuous integration and to my surprise the project kept failing. I have created the CircleCI .circleci directory and added the config.yml file there.

This is the project on GitHub - https://github.com/ken4ward/MobiquityProject
This is the error I’m getting on CircleCI

[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  7.505 s
[INFO] Finished at: 2021-07-17T12:03:58Z
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project MobiquityProject: Compilation failure -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

What should I do?