Cannot find background image materials related to EP2

Hi there,
When I want to launch any mod related to EP2 a black screen starting to flicker and this message error box appears and close the program. I didn’t make any changes in any folder, didn’t install or uninstall anything, suddenly stopped working. Does anyone know how can I fix this and why I have this error message ?
Thank you !

Can’t find background image materials/console/startup_Ioading.vtf
OK
