Can't create C++ project on UE5

I don’t read Spanish (or Portuguese?) but that error message should tell you what’s going wrong.

It may be that your disk is full, or that the location is write protected, or some other problem. In general, when starting a C++ project, you’ll want to open the Visual Studio project directly in Visual Studio, and do “Build” (ctrl-shift-B) in the IDE, with the editor closed, before you do anything else. If you haven’t tried that yet, try that and see how that goes (assuming you have disk space and write permissions and such.)