Linux (Arch): ZeroMQException(22): EINVAL

[hilpara]

I cloned the repository and wanted to test the example and got exception:

` ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ The following ZeroMQException was thrown building Builder: ZeroMQException(22): EINVAL

The relevant error-causing widget was: MaterialApp MaterialApp:file:///xxx/dartzmq/example/lib/main.dart:19:12

When the exception was thrown, this was the stack: #0 _checkErrorCode (package:dartzmq/src/exception.dart:56:5) #1 _checkReturnCode (package:dartzmq/src/exception.dart:49:5) #2 new ZMonitor (package:dartzmq/src/monitor.dart:216:5) #3 new MonitoredZSocket (package:dartzmq/src/socket.dart:360:16) #4 ZContext.createMonitoredSocket (package:dartzmq/src/zeromq.dart:228:23) #5 _MyHomePageState.initState (package:dartzmq_example/main.dart:45:24) #6 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:5618:55) #7 ComponentElement.mount (package:flutter/src/widgets/framework.dart:5463:5) ... Normal element mounting (228 frames) #235 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4340:16) #236 MultiChildRenderObjectElement.inflateWidget (package:flutter/src/widgets/framework.dart:6904:36) #237 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6916:32) ... Normal element mounting (489 frames) #726 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4340:16) #727 Element.updateChild (package:flutter/src/widgets/framework.dart:3849:18) #728 _RawViewElement._updateChild (package:flutter/src/widgets/view.dart:291:16) #729 _RawViewElement.mount (package:flutter/src/widgets/view.dart:314:5) ... Normal element mounting (7 frames) #736 Element.inflateWidget (package:flutter/src/widgets/framework.dart:4340:16) #737 Element.updateChild (package:flutter/src/widgets/framework.dart:3849:18) #738 RootElement._rebuild (package:flutter/src/widgets/binding.dart:1581:16) #739 RootElement.mount (package:flutter/src/widgets/binding.dart:1550:5) #740 RootWidget.attach. (package:flutter/src/widgets/binding.dart:1503:18) #741 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2845:19) #742 RootWidget.attach (package:flutter/src/widgets/binding.dart:1502:13) #743 WidgetsBinding.attachToBuildOwner (package:flutter/src/widgets/binding.dart:1239:27) #744 WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:1221:5) #745 WidgetsBinding.scheduleAttachRootWidget. (package:flutter/src/widgets/binding.dart:1207:7) #749 _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12) (elided 3 frames from class _Timer and dart:async-patch) `

Any ideas what went wrong and how to fix it?