I recently purchased the DLC for my son but am unsuccessful in getting the world to populate. Whether the world is newly created or loaded from a saved file, the world will populate structures, then immediately crash stating the software closed because an error occurred. Here are the error codes that display while the world is loading:

[Geometry][error]-minecraft:zombie l minecraft:zombie l Invalid render controller: controller.render.commands

[Geometry][error]-minecraft:stray l minecraft:stray l Invalid render controller: controller.render.commands

[Geometry][error]-jw:move_command l jw:move_command l Invalid render controller: controller.render.commands

[Geometry][error]-minecraft:skeleton l minecraft:skeleton l Invalid render controller: controller.render.commands

[Geometry][error]-jw:attack_command l jw:attack_command l Invalid render controller: controller.render.commands

If this issue cannot be resolved, then what is the process for a refund of purchase?