Character decoding failed. Parameter skipped

Somebody help me?
I don’t know what is that, thaks.

Parameters: Character decoding failed. Parameter skipped.
java.io.CharConversionException: isHexDigit
at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:88)
at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:49)
at org.apache.tomcat.util.http.Parameters.urlDecode(Parameters.java:410)
at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:392)
at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:508)
at org.apache.tomcat.util.http.Parameters.handleQueryParameters(Parameters.java:266)
at org.apache.catalina.connector.Request.parseParameters(Request.java:2421)
at org.apache.catalina.connector.Request.getParameterNames(Request.java:1082)
at org.apache.catalina.connector.Request.getParameterMap(Request.java:1062)
at org.apache.catalina.connector.RequestFacade.getParameterMap(RequestFacade.java:414)
at org.apache.catalina.core.ApplicationHttpRequest.parseParameters(ApplicationHttpRequest.java:728)
at org.apache.catalina.core.ApplicationHttpRequest.getParameter(ApplicationHttpRequest.java:353)
at org.apache.taglibs.standard.lang.jstl.ImplicitObjects$5.getValue(ImplicitObjects.java:434)
at org.apache.taglibs.standard.lang.jstl.EnumeratedMap.get(EnumeratedMap.java:115)
at org.apache.taglibs.standard.lang.jstl.ArraySuffix.evaluate(ArraySuffix.java:221)
at org.apache.taglibs.standard.lang.jstl.ComplexValue.evaluate(ComplexValue.java:146)
at org.apache.taglibs.standard.lang.jstl.ELEvaluator.evaluate(ELEvaluator.java:242)
at org.apache.taglibs.standard.lang.jstl.ELEvaluator.evaluate(ELEvaluator.java:201)
at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:138)
at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:166)
at org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.evaluate(ExpressionEvaluatorManager.java:112)
at org.apache.taglibs.standard.tag.el.core.ExpressionUtil.evalNotNull(ExpressionUtil.java:85)
at org.apache.taglibs.standard.tag.el.core.OutTag.evaluateExpressions(OutTag.java:137)
at org.apache.taglibs.standard.tag.el.core.OutTag.doStartTag(OutTag.java:95)
at org.apache.jsp._005fpages._005fapp._005fcommon.smsSend_jsp._jspx_meth_c_005fout_005f0(smsSend_jsp.java:112)
at org.apache.jsp._005fpages._005fapp._005fcommon.smsSend_jsp._jspService(smsSend_jsp.java:70)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:336)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:445)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:379)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:292)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:295)
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:396)
at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:347)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:182)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Thread.java:619)

brother dá uma olhada no que vc ta querendo converter, pelo visto o formato ta inválido.