This is the most common culprit. PS3 DLC is strictly . If you have a European (PAL) disc, you cannot use DLC downloaded from a North American (NTSC-U) PSN account.
The notification had been blinking on Ryu’s PS3 for three days. The Tekken Tag Tournament 2 servers had gone offline years ago, a victim of the inevitable march of console generations. But Ryu wasn’t looking for a match. He was looking for the ghosts of the past.
Then, on the seventh try, the screen flickered. The error message didn't appear. Instead, the background loading spinner appeared.