Thumbnails creation: 500 internal server error

[ag253617]

Hello
I am trying to create a Thumbnails like this

liip_imagine: resolvers: default: web_path: ~
filter_sets: cache : ~ thumb : quality : 75 filters : thumbnail : { size : [120, 90], mode : outbound } background : { size : [124, 94], position : center, color : '#000000' }

and I try to use it like that

<img src="{{ vich_uploader_asset(property, 'imageFile') | imagine_filter('thumb') }}" alt="card-img-top" style="width:100%; height:auto">

but I have an 500 internal server error in my console
GET http://localhost:8000/media/cache/resolve/thumb/images/properties/portrait.jpg 500 (Internal Server Error)
and I can't see the picture.
It can't find the image in the cache.
do you have any idea why i have this problem.