Solved
Game Crashed and It Caused Me to Lose my Shards of Time for Event
So, I was in the middle of doing the Blast from the Past Event when my game crashed, and so I lost the shards of time in my sim's inventory. Now I can't build the time travel component.
AFAIK, you should also be able to buy them through the mailbox.
Please use this thread if you have issues with any of tasks in the event: [COLLECTION] Blast From the Past: Issues with specific Tasks | EA Forums - 11865063
