# Issue with VTK in ROS Workspace

**URL:** https://discourse.vtk.org/t/issue-with-vtk-in-ros-workspace/908
**Category:** Support
**Created:** [May 6, 2019, 8:50am UTC](https://discourse.vtk.org/t/issue-with-vtk-in-ros-workspace/908 "2019-05-06T08:50:44Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![mia](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/m/da6949/32.png) [@mia](https://discourse.vtk.org/u/mia)
#### Post date: [May 6, 2019, 8:50am UTC](https://discourse.vtk.org/t/issue-with-vtk-in-ros-workspace/908/1 "2019-05-06T08:50:44Z")

</div>

Hi everyone,

I am new to Qt and ROS. I am working on Qt Creator 4.8.0 (QT with ROS plugin). I have created a catkin workspace in Qt and a `mainwindow` was created. And I am trying to add `QVTKWidget` to the `mainwindow` . It was successfully built but when it is run, an error message is displayed.

Code: mainwindow.cpp:

QVTKWidget\* vtkWidget;  
vtkWidget = new QVTKWidget();

Error:realloc(): invalid pointer: 0x00007facb5723820 \*\*\*  
======= Backtrace: =========  
/lib/x86\_64-linux-gnu/libc.so.6(+0x777e5)[0x7facb37d77e5]  
/lib/x86\_64-linux-gnu/libc.so.6(+0x85d80)[0x7facb37e5d80]  
/lib/x86\_64-linux-gnu/libc.so.6(realloc+0x22f)[0x7facb37e48ef]  
/usr/lib/x86\_64-linux-gnu/libQt5Core.so.5(\_ZN9QListData7reallocEi+0x1f)[0x7facada009cf]  
/usr/lib/x86\_64-linux-gnu/libQt5Core.so.5(\_ZN9QListData6appendEi+0x81)[0x7facada00aa1]  
/usr/lib/x86\_64-linux-gnu/libQt5Core.so.5(+0x1d6d78)[0x7facadaccd78]  
/usr/lib/x86\_64-linux-gnu/libQt5Core.so.5(_Z21qRegisterResourceDataiPKhS0\_S0_+0x2e6)[0x7facadac8b16]  
/usr/lib/x86\_64-linux-gnu/libQt5Core.so.5(+0x7bcc3)[0x7facad971cc3]  
/lib64/ld-linux-x86-64.so.2(+0x106ba)[0x7facb6c5a6ba]  
/lib64/ld-linux-x86-64.so.2(+0x107cb)[0x7facb6c5a7cb]  
/lib64/ld-linux-x86-64.so.2(+0xc6a)[0x7facb6c4ac6a]

Any solution to this?