org.apache.catalina.LifecycleException: A child container failed during start

This error message indicates that there is an issue with one of the child containers in the Tomcat server that you are trying to start. A container is a component of Tomcat that is responsible for managing web applications.

There are several possible causes for this error:

1. Incorrect configuration of the child container: Check the configuration files for the child container to ensure that they are correctly configured.

2. Dependency issues: The child container may have dependencies on other components or libraries that are not present or not correctly configured.

3. Memory issues: The child container may be running out of memory, causing it to fail during startup.

4. Network issues: The child container may be unable to connect to other components or services it depends on due to network issues.

To resolve this issue, you should investigate the logs and configuration files of the child container to identify the specific cause of the failure. Once you have identified the cause, you can take appropriate action to fix the issue and restart the Tomcat server.