When selecting an animation in DeusExCharacters\Classes\AllMinor.uc (Parse from script>Load UnrealScript file), it adds the "STARTFRAME=X" part of the animation name to Sequence to Play which causes this error. Erasing that part fixes the issue and the animation plays correctly.
Not a major issue since there's a workaround but maybe it could be erased automatically when selecting it in a future update.
When selecting an animation in DeusExCharacters\Classes\AllMinor.uc (Parse from script>Load UnrealScript file), it adds the "STARTFRAME=X" part of the animation name to Sequence to Play which causes this error. Erasing that part fixes the issue and the animation plays correctly.
Not a major issue since there's a workaround but maybe it could be erased automatically when selecting it in a future update.