If you got this error after you executed the command ./gradlew verifyMavenJarsCreated
Make sure you added the right configuration in the build.gradle() file.
Note: you do not have to apply any new plugins, you only have to make the right configuration of MavenPublication function
For making the right configuration of the MavenPublication function refer to the Tip that is attached at the end of the taskboard in Module 5 Milestone Task 1
and then execute the command ./gradlew verifyMavenJarsCreated
If you are confused as to which gradle file you have to choose, refer to the following FAQ