Solved

Driver practice

It won't let one of my drivers practice, coming into the new season im trying to test a setup, but it says there's a problem and I need to repair the car, then when I click on it it still shows a former driver there. Any ideas?

You have already done all 5 test runs with the old driver?

No i didn't, my team has only done 5/10 of it's runs. My old driver went to another team in the league who has done his test runs.

Fear not, it has sussed itself out.