So my setup is one faulty URL and a working URL. The faulty URL is supposed to fail and then call the second URL. So like a backup.
In the editor, that leads to the following error after loading the faulty URL and going for the backup:
"ToString can only be called from the main thread."
In the game, it seems to work a few times, but on the third reload of a faulty URL, it leads to some kind of varient of:
"Cannot retrieve heap variable of type 'UInt32' as type 'Single'".
Each time for a different part of the code.