Ideas
Happened to me too. I even read the messaged and clicked the option 'go back' and it still cancelled it. After being confused I logged into the app and tried to work out what happened. I thought id use the goalie one as test. It then acknowledged I had a player in a training camp evo still, after being told I couldn't start the goalie evo, I logged back inot the game and suddenly the goalie evo had been started, I clicked on the evo to check it out and then thought let me try pressing O this time instead of engaging with the text, and same result, it also removed that evo completely. Terrible design flaws and huge disadvantage to any players than did get to complete such a good evo for free. Its outrages if they dont resolve this for players like us that experienced this glitch.