# "nullptr" is undefined

**URL:** https://discourse.paraview.org/t/nullptr-is-undefined/1821
**Category:** ParaView Support
**Tags:** vtk
**Created:** [May 10, 2019, 3:59pm UTC](https://discourse.paraview.org/t/nullptr-is-undefined/1821 "2019-05-10T15:59:27Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![uturuncoglu](https://discourse.paraview.org/user_avatar/discourse.paraview.org/uturuncoglu/32/1530_2.png) [@uturuncoglu](https://discourse.paraview.org/u/uturuncoglu)
#### Post date: [May 10, 2019, 3:59pm UTC](https://discourse.paraview.org/t/nullptr-is-undefined/1821/1 "2019-05-10T15:59:27Z")

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I am trying to upgrade ParaView version of my co-processing code from 5.4.1 to 5.6.0. 5.4.1 is fine and compiles without any problem but when i try to use ParaView 5.6.0, i am getting following error

error: identifier “nullptr” is undefined

I also try to compile both my code and also ParaView 5.6.0 with CXXFLAGS="-std=c++11" flag but it does not help. Do I need to include additional header file to my code?

Thanks,

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### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [May 10, 2019, 5:53pm UTC](https://discourse.paraview.org/t/nullptr-is-undefined/1821/2 "2019-05-10T17:53:07Z")

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Try compiling with debug turned on, and then run it in a debugger? I believe it should then tell you where this error occurred?