Unable to start casasts service

Unable to start casaats service on a primary server, 'catalina.out' log file shows the following exception:
java.lang.ClassNotFoundException: org.apache.catalina.startup.Catalina
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    at org.apache.catalina.startup.Bootstrap.init(Bootstrap.java:216)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:391)

Make sure catalina properties file '$ZENWORKS_HOME/share/tomcat/conf/catalina.properties' has the following line:
common.loader=${catalina.base}/conf,${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar,${catalina.home}/../../resources/properties,${catalina.home}/../../java/lib/*.jar,${catalina.home}/../../java/lib/*.zip

NOTE: this should all be in a single line.

The parameter 'common.loader' defines the contents of the "common" classloader. Prefixes should be used to define what is the repository type. If left as blank, the JVM system loader will be used as Catalina's "common" loader explaining why it can't find the classes showed in the exception.