Lovely mod, thank you!
If anyone is having the sol error, it's because of typos in some of the .ini files for the career events. You will have to manually edit the files in question. For example, for 'content/career/series_f1_2008_championship/event8/event.ini', the weather was as follows:
NAME=sol_03_Scattered Clouds
where it actually needs to be
NAME=sol_03_scattered_clouds
All the errors I found were where the weather was two words, and instead of an underscore, the name had a space (Heavy Drizzle, etc.). Fix these errors, and everything will work.