White screen problem when previewing project

Hello,

I posted my question on the Robo Recall modding forum [here][1] but I feel like there is no activity so here is my copy on AnswerHub.

I just installed the Robo Recall mod kit, started a new Gun mod but I cannot run the preview.
I just have a white preview screen in both the PC and the Rift (tried in Selected Viewport, New Editor Window, VR Preview).

If i move the touch controller I can hear that there is the menu being highlighted, but nothing is displayed…
I have some errors in the logs, please see below:

I’m currently running in UE 4.19.1.
Please note that if I run another VR project in UE, it’s working fine

Thank you for your help!

I tried updating to UE 4.20 but didn’t make a difference.