Developed a targeted user experience enhancement for the OpenRA/OpenRA repository by introducing a dedicated UI error state that appears when incompatible generated maps are loaded in the lobby preview. This feature was implemented using C#, Fluent, and YAML, leveraging container-based UI architecture and localization to ensure clear, mod-aware messaging for CNC and common mods. The approach focused on improving user clarity and consistency across different mod configurations, supporting future map-validation workflows. No bug fixes were addressed during this period, as the work concentrated on robust feature delivery and traceable code changes, resulting in a more intuitive and maintainable lobby interface.