Client error - Could not send messageorg.json.JSONException: A JSONArray text must start with '[' at 1 [character 2 line 1]
 at org.json.JSONTokener.syntaxError(JSONTokener.java:433)
 at org.json.JSONArray.<init>(JSONArray.java:106)
 at org.json.JSONArray.<init>(JSONArray.java:145)
 at com.mashape.unirest.http.JsonNode.<init>(JsonNode.java:48)
Caused: java.lang.RuntimeException
 at com.mashape.unirest.http.JsonNode.<init>(JsonNode.java:51)
 at com.mashape.unirest.http.HttpResponse.<init>(HttpResponse.java:95)
Caused: java.lang.RuntimeException
 at com.mashape.unirest.http.HttpResponse.<init>(HttpResponse.java:106)
 at com.mashape.unirest.http.HttpClientHelper.request(HttpClientHelper.java:139)
Caused: com.mashape.unirest.http.exceptions.UnirestException
 at com.mashape.unirest.http.HttpClientHelper.request(HttpClientHelper.java:143)
 at com.mashape.unirest.request.BaseRequest.asJson(BaseRequest.java:68)
 at jenkins.plugins.rocketchatnotifier.rocket.RocketChatClientCallBuilder.login(RocketChatClientCallBuilder.java:97)
Caused: java.io.IOException
 at jenkins.plugins.rocketchatnotifier.rocket.RocketChatClientCallBuilder.login(RocketChatClientCallBuilder.java:99)
 at jenkins.plugins.rocketchatnotifier.rocket.RocketChatClientCallBuilder.buildCall(RocketChatClientCallBuilder.java:80)
 at jenkins.plugins.rocketchatnotifier.rocket.RocketChatClientCallBuilder.buildCall(RocketChatClientCallBuilder.java:71)
 at jenkins.plugins.rocketchatnotifier.rocket.RocketChatClientImpl.getChannels(RocketChatClientImpl.java:74)
 at jenkins.plugins.rocketchatnotifier.RocketClientImpl.<init>(RocketClientImpl.java:30)
 at jenkins.plugins.rocketchatnotifier.RocketChatNotifier$DescriptorImpl.doTestConnection(RocketChatNotifier.java:337)
 at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
 at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
 at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
 at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
 at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
 at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
 at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
 at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
 at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
 at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
 at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
 at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
 at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
 at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)
 at org.jenkinsci.plugins.ssegateway.Endpoint$SSEListenChannelFilter.doFilter(Endpoint.java:225)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
 at io.jenkins.blueocean.auth.jwt.impl.JwtAuthenticationFilter.doFilter(JwtAuthenticationFilter.java:61)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
 at io.jenkins.blueocean.ResourceCacheControl.doFilter(ResourceCacheControl.java:134)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
 at jenkins.metrics.impl.MetricsFilter.doFilter(MetricsFilter.java:125)
 at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:132)
 at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:138)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:80)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
 at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:90)
 at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
 at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
 at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
 at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)
 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
 at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
 at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
 at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
 at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
 at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
 at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
 at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
 at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
 at org.eclipse.jetty.server.Server.handle(Server.java:564)
 at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317)
 at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
 at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
 at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
 at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
 at org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128)
 at org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)
 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)
 at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:199)
 at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)