# Slicer (using Slicer RT module) crashes when saving. 'MRMLcore.dll' error from Windows event log

**URL:** <https://discourse.slicer.org/t/slicer-using-slicer-rt-module-crashes-when-saving-mrmlcore-dll-error-from-windows-event-log/970>\
**Category:** Support\
**Tags:** segmentation, slicerrt, file-export\
**Created:** [August 30, 2017, 3:08pm UTC](https://discourse.slicer.org/t/slicer-using-slicer-rt-module-crashes-when-saving-mrmlcore-dll-error-from-windows-event-log/970 "2017-08-30T15:08:48Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![LauDel](https://avatars.discourse-cdn.com/v4/letter/l/439d5e/32.png) [@LauDel](https://discourse.slicer.org/u/LauDel)\
**Post date:** [August 30, 2017, 3:08pm UTC](https://discourse.slicer.org/t/slicer-using-slicer-rt-module-crashes-when-saving-mrmlcore-dll-error-from-windows-event-log/970/1 "2017-08-30T15:08:48Z")

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Operating system: Windows 7 Enterprise 64bit  
Slicer version: 4.6.2  
Expected behavior: The scene should be saved as mrml scene OR separate components (both approaches fail)  
Actual behavior: Slicer hangs for a few seconds on the saving screen, then slicer becomes unresponsive and windows gives the error ‘Slicerapp-real doesn’t work anymore’ and I’m forced to select ‘close program’. No error is given.

I found the error in Windows event log. It is filed as an application error where SlicerApp-real.exe failed were the module MRMLCore.dll gave an error.

This problem happens everytime I try to save my work. Maybe of importance: I run slicer as an administrator because if i don’t i cannot access my installed modules (there are strict admin-user rights at my institution)

Any help would be much appreciated!

Greetings,  
Laurence

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [August 30, 2017, 3:26pm UTC](https://discourse.slicer.org/t/slicer-using-slicer-rt-module-crashes-when-saving-mrmlcore-dll-error-from-windows-event-log/970/2 "2017-08-30T15:26:56Z")

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Hi Laurence,

4.6.2 is approaching its first birthday, and many issues have been fixed and many features added since then. Even if we find the root of the problem, it is unlikely we fix a 10-month old release. Please try the latest nightly.

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**Author:** ![LauDel](https://avatars.discourse-cdn.com/v4/letter/l/439d5e/32.png) [@LauDel](https://discourse.slicer.org/u/LauDel)\
**Post date:** [August 31, 2017, 6:50am UTC](https://discourse.slicer.org/t/slicer-using-slicer-rt-module-crashes-when-saving-mrmlcore-dll-error-from-windows-event-log/970/3 "2017-08-31T06:50:43Z")

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Hello Csaba,

Thank you for your feedback. I’ve installed the latest nightly, hower SlicerRT is not available (yet). I really need  
this module because I have to import RT Structure sets. So this is not an option for me.

Greetings,  
Laurence

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<div class="post-metadata">

**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [August 31, 2017, 12:49pm UTC](https://discourse.slicer.org/t/slicer-using-slicer-rt-module-crashes-when-saving-mrmlcore-dll-error-from-windows-event-log/970/4 "2017-08-31T12:49:14Z")

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It is available now.

In the future you can download nightlies from past days using this modifier in the url  
[http://download.slicer.org/?offset=-1](http://download.slicer.org/?offset=-1)