Un unknown error occurred while starting the server.

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Hello,   I am a newbie and I am taking the Mendix Rapid developer certification. I am building my first application but I can't run it because I get an error when I try to start the app. Below I share the error code. Can anyone help me solve it, thanks.   The version of Mendix Studio Pro Version is 10.21.1.   Mendix.Modeler.RuntimeConnector.M2EEException: The server encountered an error.   at Mendix.Modeler.RuntimeConnector.M2EEResponse.CheckSuccess() in Mendix.Modeler.RuntimeConnector\M2EEResponse.cs:line 57   at Mendix.Modeler.RuntimeConnector.M2EEClient.UpdateAppContainerConfiguration(Int32 port, String listenAddresses) in Mendix.Modeler.RuntimeConnector\M2EEClient.cs:line 145   at Mendix.Modeler.RuntimeConnector.StartupManager.<>c__DisplayClass5_0.<PerformStartup>b__0() in Mendix.Modeler.RuntimeConnector\StartupManager.cs:line 38   at Mendix.Modeler.Analytics.RuntimeProfilingAnalyticsScope.<>c__DisplayClass8_0.<Execute>b__0() in Mendix.Modeler.Analytics\RuntimeProfilingAnalyticsScope.cs:line 70   at Mendix.Modeler.Analytics.RuntimeProfilingAnalyticsScope.Execute[T](IAnalyticsEventManager eventManager, String eventType, String deploymentId, Func`1 op) in Mendix.Modeler.Analytics\RuntimeProfilingAnalyticsScope.cs:line 49   at Mendix.Modeler.Analytics.RuntimeProfilingAnalyticsScope.Execute(IAnalyticsEventManager eventManager, String eventType, String deploymentId, Action op) in Mendix.Modeler.Analytics\RuntimeProfilingAnalyticsScope.cs:line 64   at Mendix.Modeler.RuntimeConnector.StartupManager.PerformStartup(StartupInfo info, String deploymentId, IM2EEClient client) in Mendix.Modeler.RuntimeConnector\StartupManager.cs:line 34   at Mendix.Modeler.RuntimeConnector.RuntimeController.Start(StartupInfo info, String deploymentId, LogLevel autoSubscribeLogLevel) in Mendix.Modeler.RuntimeConnector\RuntimeController.cs:line 146   at Mendix.Modeler.Deployment.Local.LocalRunner.<>c__DisplayClass100_0.<RuntimeLaunched>b__1() in Mendix.Modeler.Deployment\Local\LocalRunner.cs:line 459   at Mendix.Modeler.Utility.BackgroundUtil.<>c__DisplayClass1_0`1.<Do>b__0(Object s, DoWorkEventArgs e) in Mendix.Modeler.Utility\BackgroundUtil.cs:line 36   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
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Do you mean the Become a Rapid Developer learning path?

If so, this learning path was built for Mendix Studio 10.0.0. It's generally best to use the Mendix version listed in the learning paths, as that's the ones they were built for. Newer versions might have different functionality or some things might not work.

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If you're also getting the issue in 10.0.0, we could have a further look and see what's wrong.

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Hello Eline, I changed to version 10.0.0 and miraculously it worked. Thank you very much for the tip. I must admit that I was surprised by the fact that the mendix depends on the software versions... I'm always learning :)

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