Unable to create page in Mendix 7.6: The version check failed

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Hi All,   I am trying to make an app using Mendix 7.6, but in the Modeler, whenever I right click and hit 'add page' I get a modeler error saying 'Oops! Something went wrong in the Modeler' and I am asked to submit feedback.  I have a workaround where I duplicate and existing page, but this is annoying.  I believe there is an error with the Atlas UI.  I think this because the details provided to me about the error are outlined in the stacktrace below.  Has anyone seen this before?   Mendix.Modeler.Utility.Progress.ProgressException ---> System.IO.FileLoadException: The version check for C:\Users\XXX\AppData\Local\Temp\Mendix\7.6.0\AtlasUI_default_app.mpr failed.    at Mendix.Modeler.WebUI.Forms.PageTemplates.PageTemplateProjectLoader.LoadProject(String projectFilePath) in C:\jenkins\workspace\WebUI-Build\modeler\Mendix.Modeler.WebUI\Forms\PageTemplates\PageTemplateProjectLoader.cs:line 104    at Mendix.Modeler.WebUI.Forms.PageTemplates.PageTemplateProjectLoader.<>c__DisplayClass11_0.<LoadPageTemplatesProject>b__1(IProgressInfo info) in C:\jenkins\workspace\WebUI-Build\modeler\Mendix.Modeler.WebUI\Forms\PageTemplates\PageTemplateProjectLoader.cs:line 74    at Mendix.Modeler.Utility.Progress.ProcessRunner.RunStep(Step step) in C:\jenkins\workspace\Modeler-Build\modeler\Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 88    at Mendix.Modeler.Utility.Progress.ProcessRunner.worker_DoWork(Object sender, DoWorkEventArgs e) in C:\jenkins\workspace\Modeler-Build\modeler\Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 68    at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)    at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)    --- End of inner exception stack trace ---    at Mendix.Modeler.Utility.Progress.ProcessRunner.Run() in C:\jenkins\workspace\Modeler-Build\modeler\Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 50    at Mendix.Modeler.WebUI.Forms.PageTemplates.PageTemplateProjectLoader.LoadPageTemplatesProject(PageTemplateType type) in C:\jenkins\workspace\WebUI-Build\modeler\Mendix.Modeler.WebUI\Forms\PageTemplates\PageTemplateProjectLoader.cs:line 80    at Mendix.Modeler.WebUI.Forms.PageTemplates.PageTemplateProjectLoader.LoadForProject(IProject project) in C:\jenkins\workspace\WebUI-Build\modeler\Mendix.Modeler.WebUI\Forms\PageTemplates\PageTemplateProjectLoader.cs:line 54    at Mendix.Modeler.WebUI.Forms.Documents.Pages.PageDocumentType.CreatePage(IFolder container, String namePrefix, PageTemplateKind templateKind) in C:\jenkins\workspace\WebUI-Build\modeler\Mendix.Modeler.WebUI\Forms\Documents\Pages\PageDocumentType.cs:line 49    at Mendix.Modeler.WebUI.Forms.Documents.Pages.PageDocumentType.CreateDocument(IFolder container, String suggestedName) in C:\jenkins\workspace\WebUI-Build\modeler\Mendix.Modeler.WebUI\Forms\Documents\Pages\PageDocumentType.cs:line 42    at Mendix.Modeler.Common.NamedDocumentType`1.Mendix.Modeler.Common.INamedDocumentType.CreateDocument(IFolder container) in C:\jenkins\workspace\Modeler-Build\modeler\Mendix.Modeler.Core\Common\Model\NamedDocumentType.cs:line 67    at Mendix.Modeler.Projects.ProjectExplorers.FolderBaseNode.AddDocumentOfType(IFolder container, INamedDocumentType documentType) in C:\jenkins\workspace\Modeler-Build\modeler\Mendix.Modeler.Core\Projects\ProjectExplorers\FolderBaseNode.cs:line 163    at Mendix.Modeler.Projects.ProjectExplorers.FolderBaseNode.AddDocument(ProjectExplorerControl control, IFolder container, INamedDocumentType documentType) in C:\jenkins\workspace\Modeler-Build\modeler\Mendix.Modeler.Core\Projects\ProjectExplorers\FolderBaseNode.cs:line 156    at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)    at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)    at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)    at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)    at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)    at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)    at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)    at System.Windows.Forms.Control.WndProc(Message& m)    at System.Windows.Forms.ToolStrip.WndProc(Message& m)    at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)    at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
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I have found a solution for this and it involved deleting the ... Temp\Mendix\ directory and its contents.  That did the trick for me.

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Hi Rob,

Yes I've experienced this before (7.5 I think, but same error), kept popping up. With me it was removing an input parameter that gave me this error.

I've successfully provided a test project and reproduction steps to support, which let me know that a fix will be included in 7.7. Hopefully (if it's the same problem: perhaps someone has a solution) that'll solve your issues as well!

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