# CUDA error message: invalid device symbol after Skydel upgrade to v23.8.0

**URL:** <https://learn.safran-navigation-timing.com/t/cuda-error-message-invalid-device-symbol-after-skydel-upgrade-to-v23-8-0/1163>\
**Category:** Skydel Discussion\
**Created:** [October 12, 2023, 9:39am UTC](https://learn.safran-navigation-timing.com/t/cuda-error-message-invalid-device-symbol-after-skydel-upgrade-to-v23-8-0/1163 "2023-10-12T09:39:48Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![kchereshnev](https://avatars.discourse-cdn.com/v4/letter/k/46a35a/32.png) [@kchereshnev](https://learn.safran-navigation-timing.com/u/kchereshnev)\
**Post date:** [October 12, 2023, 9:39am UTC](https://learn.safran-navigation-timing.com/t/cuda-error-message-invalid-device-symbol-after-skydel-upgrade-to-v23-8-0/1163/1 "2023-10-12T09:39:48Z")

</div>

Hi,  
i have recently upgraded our GSG-842 simulator to version 23.8.0  
after that i cannot Start any simulation, because following error:  
CUDA error message: invalid device symbol

error appears even if i create Default configuration from scratch (not using configuration, created with older versions of Skydel).

Issue is critical - all out activities with simulator stopped.

support case also was created, number = 00305378

---

<div class="post-metadata">

**Author:** ![A-D](https://avatars.discourse-cdn.com/v4/letter/a/50afbb/32.png) [@A-D](https://learn.safran-navigation-timing.com/u/A-D)\
**Post date:** [October 12, 2023, 1:50pm UTC](https://learn.safran-navigation-timing.com/t/cuda-error-message-invalid-device-symbol-after-skydel-upgrade-to-v23-8-0/1163/2 "2023-10-12T13:50:17Z")

</div>

Thank you for your post @kchereshnev ,

we are looking into this now.

In the meantime, you can confirm that you are using at minimum Nvidia driver version 520.61.05?

AD

---

<div class="post-metadata">

**Author:** ![kchereshnev](https://avatars.discourse-cdn.com/v4/letter/k/46a35a/32.png) [@kchereshnev](https://learn.safran-navigation-timing.com/u/kchereshnev)\
**Post date:** [October 13, 2023, 9:13am UTC](https://learn.safran-navigation-timing.com/t/cuda-error-message-invalid-device-symbol-after-skydel-upgrade-to-v23-8-0/1163/3 "2023-10-13T09:13:31Z")

</div>

shame on me!  
i haven’t upgraded NVIDIA driver, **as it is noted on Skydel update page**.

Current results:

1. i have upgraded NVIDIA driver to version 535.113 following steps from here [https://learn.safran-navigation-timing.com/t/update-nvidia-drivers-offline-ubuntu/789](https://urldefense.com/v3/ __https:/learn.safran-navigation-timing.com/t/update-nvidia-drivers-offline-ubuntu/789__ ;!!Nbma_1s!rAydrV5sWZwKRIfADMiQe_xqFtldmJOQsLnsqzO6dg0iQqEBTx5JIIIC72WmMwvdpw719suNdsD6Sm9Ae0C_dT6XaMyMoxmbJUC9L8ZHoK8$)
2. after NVIDIA driver upgrade my Skydel version 23.8.0 starts as expected **without CUDE error**

thanks for support!

p.s. after upgrading of NVIDIA drive resolution of my Display, connected to GSG simulator via Display Port went to 640x480 (very low).

1. i could not change resolution using User Interface of Ubuntu
2. i could not change resolution using terminal and xrandr command  
solution - you need to disable nouveau driver on you Ubuntu (google something like [16.04 - How to disable Nouveau kernel driver - Ask Ubuntu](https://askubuntu.com/questions/841876/how-to-disable-nouveau-kernel-driver))

---

<div class="post-metadata">

**Author:** ![A-D](https://avatars.discourse-cdn.com/v4/letter/a/50afbb/32.png) [@A-D](https://learn.safran-navigation-timing.com/u/A-D)\
**Post date:** [October 16, 2023, 7:36pm UTC](https://learn.safran-navigation-timing.com/t/cuda-error-message-invalid-device-symbol-after-skydel-upgrade-to-v23-8-0/1163/4 "2023-10-16T19:36:05Z")

</div>

Glad to hear everything is working well @kchereshnev !

And thanks for the DisplayPort note… we will look into that and see if we can reproduce.

AD