salat_1364 wrote:The problem comes when you want to run another file while your "km player" is still open.
Ok, now I understand. But there's nothing I can do on my side, it's a problem with KMPlayer which behaves strangely.
I've looked at KMPlayer's preferences, and if you uncheck "disallow multiple instances" at the bottom right, then the error message stops appearing, but you end up having 2 videos playing at the same time. It's a little weird, but I couldn't find a better adjustment of the settings. I guess you have to stop the video playing before launching another one