# Cannot start Slicer.exe after a release build

**URL:** <https://discourse.slicer.org/t/cannot-start-slicer-exe-after-a-release-build/767>\
**Category:** Development\
**Created:** [July 26, 2017, 2:04am UTC](https://discourse.slicer.org/t/cannot-start-slicer-exe-after-a-release-build/767 "2017-07-26T02:04:44Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![JK\_Kim](https://avatars.discourse-cdn.com/v4/letter/j/b9bd4f/32.png) [@JK\_Kim](https://discourse.slicer.org/u/JK_Kim)\
**Post date:** [July 26, 2017, 2:04am UTC](https://discourse.slicer.org/t/cannot-start-slicer-exe-after-a-release-build/767/1 "2017-07-26T02:04:44Z")

</div>

I just built a release version but when I double click Slicer.exe (win7) I get the following error. Am I not running it correct? No error during building…

Debug Assertion Failed  
Program: …licer\SlicerBuild\Slicer-build\bin\Release\SlicerApp-real.exe  
File: f:\dd\vctools\crt\crtw32\misc\dbgdel.cpp  
Line:52

Expression: \_BLOCK\_TYPE\_IS\_VALID(pHeap-\>nBlockUse)