HTTP ERROR 400 Unable to parse URI query

URI:/utdanning/yrker/yrke
STATUS:400
MESSAGE:Unable to parse URI query
SERVLET:dispatcherServlet
CAUSED BY:org.eclipse.jetty.http.BadMessageException: 400: Unable to parse URI query
CAUSED BY:org.eclipse.jetty.util.Utf8Appendable$NotUtf8Exception: Not valid UTF8! char appended in state 36