What is the reason behind the error message "java: module not found: marytts.builder" in IntelliJ?

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The error message "java: module not found: marytts.builder" in IntelliJ indicates that the Java module named "marytts.builder" is not present in the project or on the classpath. This can happen if the module is missing or if it has not been properly imported or configured in the project. To resolve the issue, check that the module is properly installed and configured, and ensure that it is included in the project's classpath.