Hi, I have the following error in each start of matlab , when I put >> cd([matlab​root,'/Jav​a/jar/tool​box']), seem all files available

java.lang.NoClassDefFoundError: com/mathworks/toolbox/rptgenxmlcomp/plugin/CTypeDeterminantXMLRoot
  at com.mathworks.toolbox.rptgenslxmlcomp.plugins.slx.SlxComparisonPlugin.addComparisonTypes(SlxComparisonPlugin.java:28)
  at com.mathworks.toolbox.rptgenslxmlcomp.plugins.slx.SlxComparisonPlugin.<init>(SlxComparisonPlugin.java:17)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
  at java.lang.reflect.Constructor.newInstance(Unknown Source)
  at java.lang.Class.newInstance0(Unknown Source)
  at java.lang.Class.newInstance(Unknown Source)
  at com.mathworks.util.osgi.ServicesActivator.registerServicePair(ServicesActivator.java:58)
  at com.mathworks.util.osgi.ServicesActivator.parseServices(ServicesActivator.java:38)
  at com.mathworks.util.osgi.ServicesActivator.start(ServicesActivator.java:33)
  at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:589)
  at org.apache.felix.framework.Felix.startBundle(Felix.java:1458)
  at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:984)
  at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:263)
  at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.mathworks.toolbox.rptgenxmlcomp.plugin.CTypeDeterminantXMLRoot
  at java.net.URLClassLoader$1.run(Unknown Source)
  at java.net.URLClassLoader$1.run(Unknown Source)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(Unknown Source)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
  at java.lang.ClassLoader.loadClass(Unknown Source)
  ... 16 more