Object reference not set to an instance of an object.
1
I'm currently trying to run my app locally in Mendix Studio Pro, but instead of my app, i get an error: System.NullReferenceException: Object reference not set to an instance of an object. at Mendix.Modeler.Deployment.CoreMetadataWriter.WriteMetadataProperties(IProject project, JsonWriter writer) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Deployment\CoreMetadataWriter.cs:line 58 at Mendix.Modeler.Deployment.MetadataFileGenerator.GenerateMetadataFile(IProject project) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Deployment\MetadataFileGenerator.cs:line 37 at Mendix.Modeler.Deployment.CoreDeploymentWork.GenerateFiles(IProject project, DeploymentSettings settings, Boolean generateForLocalDeployment) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Deployment\CoreDeploymentWork.cs:line 126 at Mendix.Modeler.Deployment.CoreDeploymentWork.WriteFiles(IProject project, DeploymentSettings settings, IProgressInfo info, Boolean generateForLocalDeployment) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Deployment\CoreDeploymentWork.cs:line 90 at Mendix.Modeler.Deployment.DeploymentProcessBuilder.<>c__DisplayClass12_0.<AddBuildStepsForPhase>b__0(IProgressInfo info) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Deployment\DeploymentProcessBuilder.cs:line 123 at Mendix.Modeler.Deployment.FileIOExceptionHandlingProcess.CatchDiskException(Action action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Deployment\FileIOExceptionHandlingProcess.cs:line 28 at Mendix.Modeler.Deployment.FileIOExceptionHandlingProcess.<>c__DisplayClass1_0.<AddStep>b__0(IProgressInfo info) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Deployment\FileIOExceptionHandlingProcess.cs:line 19 at Mendix.Modeler.UIFramework.Progress.ProcessRunner.RunStep(Step step) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 97 at Mendix.Modeler.UIFramework.Progress.ProcessRunner.OnDoWork(Object sender, DoWorkEventArgs e) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 71 at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e) at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument) My Studio Pro version is 8.18.2
asked
Nick van Drielen
1 answers
3
I’ve seen this before if the administrator user role is no longer correctly selected in the project security.
This may happen if security is turned off, while the administrator user role is not selected/no longer exists.
To solve this, set security to either demo/production, and select a user role on the administrator tab. If needed, you can turn security off again and close the dialog.