@PrasadN16719109 The java.lang.NoClassDefFoundError typically occurs when the Java runtime cannot find a class that was available during compile-time but is missing at runtime. To resolve this, check that the class com/pega/mkt/strategy/SegmentFilterCache is correctly packaged and included in the application's classpath. Ensure that all necessary libraries and dependencies are deployed in the production environment. It's also important to confirm that the correct version of the Pega Marketing components is in place. If the class is part of an external jar, ensure that the jar is correctly referenced and available to the application. Review the deployment process to confirm all required files are being deployed and accessible. Also check for any issues with classloader configurations or conflicts between different versions of the same class. Thanks