Lo-Fi Games

the buildings of my base have disappeared

if you mean, some of your buildings now belong to another faction
then you need to go to the main menu. go to import. select the save you wish to import. then click ok, leave all settings at default.
this will fix your issue.

Hello the building of my base have dipared . I have this message ; This save is missing files. This will likely cause issues such as missing player buildings. Please send us your save.log file to help us track down the problem. i am sorry no speake english

please send us your save logs

Unfortunately, if the buildings have disappeared, nothing cam be done to recover them, except for reloading an older save that still has them.

Them disappearing like that means the game failed to save them the last time you saved the game, so they no longer exist on that save.