Plutonium

Resxt it tells me all the time that there is an uninstalled file and that they are installing it and otherwise I have a screen of what it does to me as a bug, here it is

Hi everyone ! I have a problem with my game, I play with the steam version with the plutonium (right there no crash) but at the moment when I want to play in a server or a custom game in Nuketown 2025 the game crash or make me back in the lobby but I have install the map on Steam, I don't know if with the plutonium mode I have 2 times the nuketown map or something else, can you help me plz ?