Ok, lets be very specific to find out what its going on.
TOCA2FREAK, please tell me at what point exactly do you have this error? Is it when you select some log in Results Viewer? Is it the same if you select any other logs? If it is one log, sent it to me.
Also try launching r2la differently. If you used r2la.bat, now try starting by
rF2 Log Analyzer ver. 2.058.24\web2py\web2py.exe and vice versa.
I hope you didn't delete your 2.058.23 version and can use that for now. Here is the
link to 2.058.23 if needed.
UPD. Reading your error message, it looks like its was during r2la first time import of log files after first form submission? If yes, that's strange, I didn't change anything there... Maybe you have some really big log files, like the ones near a GB that were created with some rFactor2 builds weeks ago (but then it was fixed by S397).
ECAR_Tracks, error in the screen you posted is not the same as TOCA posted. Do you have this error with all logs or only that one log? It looks to me like a problem with some driver name in xml (driver with empty name). If its just one or several logs from sessions with similar mod, send that logs to me, I will look at them.