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I opened an application that I developed by Unity in HoloLens, but the application only lasted for 1-2 minutes each time, then it went black. The black screen lasted for about 10 seconds, then a pop-up window appeared. The pop-up window showed a cross in the center, as shown in the picture. I tried various methods to solve it, but none of them worked, so I came here for help.
I referred to the solution mentioned in this question (Close splash screen in Hololens 2 with unity)
(It is by design and can only be closed manually, every app starts in mixed reality by placing an app tile in the Windows Mixed Reality home and these tiles persist and stay at their placed location. For more information please see: App model
In addition to this, you can add a custom holographic splash screen for the app, please refer to this link: Holographic splash screen),
but it did not solve my problem.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(265.6, 1%, 35%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EZW%3C/text%3E%3C/svg%3E)
Hello, Welcome to Microsoft Q&A,
It looks like the project crashed. Could you provide your Unity version and HoloLens OS version? Could you share with us more details about your project? Does this issue only occur in this project, or does it occur in all projects?
Also, please check the log files in Device Portal/System/File explorer/LocalAppData/[ProjectName]/TempState to see if there are any error messages.
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