Indeed, and I believe it could be because you may have missing tomcat references in the serverConf.xml file, it should look something like the following, can you please check, and perform the following command: nlserver config -reload
<!-- Class Path to use when starting JVM
-->
<classpath>$(XTK_INSTALL_DIR)/tomcat-7/bin/bootstrap.jar
$(XTK_INSTALL_DIR)/tomcat-7/bin/tomcat-juli.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/tomcat-coyote.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/tomcat-util.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/tomcat-api.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/servlet-api.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/jsp-api.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/el-api.jar
$(XTK_INSTALL_DIR)/java/lib/log4j-1.2.11.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/annotations-api.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/catalina.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/websocket-api.jar
$(XTK_INSTALL_DIR)/tomcat-7/lib/tomcat7-websocket.jar
$(XTK_INSTALL_DIR)/java/lib/PDFBox-0.7.3.jar
$(XTK_INSTALL_DIR)/java/lib/FontBox-0.1.0.jar
$(XTK_INSTALL_DIR)/java/lib/AGJavaEndpoint.22.jar
$(XTK_INSTALL_DIR)/java/lib/NSGConstants.jar
$(XTK_INSTALL_DIR)/java/lib/smpp.jar
$(XTK_INSTALL_DIR)/java/lib/nlweb.jar
$(XTK_INSTALL_DIR)/java/lib/weka.jar
$(XTK_INSTALL_DIR)/java/lib/KxCommonInterf.jar
$(XTK_INSTALL_DIR)/java/lib/KxJni.jar
$(XTK_INSTALL_DIR)/java/lib/KxJniInterf.jar
$(XTK_INSTALL_DIR)/java/lib/KxUtils.jar
$(XTK_INSTALL_DIR)/java/lib/jcaptcha-all.jar
$(XTK_INSTALL_DIR)/java/lib/apns-1.0.0.Beta6-jar-with-dependencies.jar
$(XTK_INSTALL_DIR)/java/lib/commons-collections-3.2.jar
$(XTK_INSTALL_DIR)/java/lib/jcommon-1.0.16.jar
$(XTK_INSTALL_DIR)/java/lib/jfreechart-1.0.13.jar
$(XTK_INSTALL_DIR)/java/lib/barcode4j-light.jar
$(XTK_INSTALL_DIR)/java/lib/zxing.jar
$(XTK_INSTALL_DIR)/java/lib/raztec.jar
$(XTK_INSTALL_DIR)/java/lib/gson-2.7.jar
$(XTK_INSTALL_DIR)/java/lib/alpn-api-1.1.3.v20160715.jar
$(XTK_INSTALL_DIR)/java/lib/netty-all-4.1.6.Final.jar
$(XTK_INSTALL_DIR)/java/lib/netty-tcnative-boringssl-static-1.1.33.Fork22.jar
$(XTK_INSTALL_DIR)/java/lib/pushy-0.8.1.jar
$(XTK_INSTALL_DIR)/java/lib/slf4j-api-1.7.21.jar
$(XTK_INSTALL_DIR)/java/lib/slf4j-simple-1.7.21.jar
$(OOO_URE_INSTALL_DIR)/java/juh.jar
$(OOO_URE_INSTALL_DIR)/java/ridl.jar
$(OOO_URE_INSTALL_DIR)/java/jurt.jar
$(OOO_BASIS_INSTALL_DIR)/program/classes/unoil.jar
$(OOO_INSTALL_DIR)/classes/juh.jar
$(OOO_INSTALL_DIR)/classes/ridl.jar
$(OOO_INSTALL_DIR)/classes/unoil.jar
$(OOO_INSTALL_DIR)/classes/jurt.jar</classpath>
</jsp>