Solr HTTP error: OK (500) Error 500 Server Error

HTTP ERROR 500

Problem accessing /solr/products/select. Reason: 

    Server Error

Caused by:

org.apache.solr.common.SolrException: URLDecoder: Invalid character encoding detected after position 39 of query string / form data (while parsing as UTF-8)
	at org.apache.solr.servlet.SolrRequestParsers.decodeChars(SolrRequestParsers.java:391)
	at org.apache.solr.servlet.SolrRequestParsers.decodeBuffer(SolrRequestParsers.java:407)
	at org.apache.solr.servlet.SolrRequestParsers.parseFormDataContent(SolrRequestParsers.java:374)
	at org.apache.solr.servlet.SolrRequestParsers.parseQueryString(SolrRequestParsers.java:274)
	at org.apache.solr.servlet.SolrRequestParsers.parseQueryString(SolrRequestParsers.java:244)
	at org.apache.solr.servlet.HttpSolrCall.<init>(HttpSolrCall.java:174)
	at org.apache.solr.servlet.SolrDispatchFilter.getHttpSolrCall(SolrDispatchFilter.java:383)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:342)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:296)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1691)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
	at org.eclipse.jetty.server.Server.handle(Server.java:534)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
	at java.lang.Thread.run(Thread.java:748)