If I have a Panel with background-image: url("file://{images}/whatever.png"); and I try to make a keyframes animation for moving the background-position over time, the compiler returns with error an error: background-image property listed in a keyframe but marked as cannot transition.

animation_container is an empty <Panel>

CSS CODE:
#animation_container{
width: 1920px;
height: 1080px;
background-image: url('path/whatever.png');
animation-name: myAnimation;
animation-duration: 3s;
animation-iteration-count: infinite;
animation-timing-function: linear;
}
@keyframes 'myAnimation' {
0% {background-position: 0px 0px;}
25% {background-position: -200px 350px;}
50% {background-position: -300px 650px;}
75% {background-position: -350px 800px;}
100% {background-position: -500px 1000px;}
}