In your case i highly suspect than this is due to the chineses caracters unsuported by one of the used softwares. Most probably Mondrian (knowagewhatifengine) or Knowage itself.
For a starter, check first than UTF-8 is set in CATALINA_OPTS or JAVA_OPTS as said here and here.
Also try to avoid chinese comments in the Mondrian XML file to see if it the cause of the problem.
Finaly have a look to this. I do not know the place in Knowage to setup the Mondrian engine, but maybe you have to add this stuff in /knowagewhatifengine/WEB-INF/web.xml