HTTP ERROR 400 Unable to parse URI query

URI:/ottawa/home
STATUS:400
MESSAGE:Unable to parse URI query
SERVLET:dispatcher
CAUSED BY:javax.servlet.ServletException: org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.eclipse.jetty.http.BadMessageException: 400: Unable to parse URI query
CAUSED BY:org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.eclipse.jetty.http.BadMessageException: 400: Unable to parse URI query
CAUSED BY:org.eclipse.jetty.http.BadMessageException: 400: Unable to parse URI query
CAUSED BY:org.eclipse.jetty.util.Utf8Appendable$NotUtf8Exception: Not valid UTF8! byte Ae in state 0