The pregame concert series leading up to Super Bowl LII is seeing some turbulence, as Nomadic Entertainment Group has reportedly filed a lawsuit in federal court against Mystic Lake Casino related to the failure of a planned temporary venue to host the events.

Nomadic, which is connected with the NFL itself via its On Location Experiences ownership/partnership, claims it spent $2.4 million to build the temporary structure, and now has to spend another million to tear it down. They are asking for a share of the casino’s revenues from the concerts and a judgement releasing it from liability for a $5 million performance bond, according to the Pioneer Press in Minnesota.

The planned venue was similar to one built in Houston last year prior to Super Bowl LI. Club Nomadic was scheduled to host concerts by the Chainsmokers, Kygo and Elle Goulding, Florida Georgia Line, and Gwen Stefani. Tickets were originally priced at $200 and went all the way to $1,500.

The casino decided to terminate the project on January 10, announcing two days later that “we determined that it would be impossible to ensure an event that is up to our standards of quality.” The Goulding show was cancelled, and the other four performers were moved to existing spaces within the casino.

As of Tuesday, prices have plummeted to as little as $59 per ticket for the performances. Prices for the big game itself have also been on a continuous slide since Sunday evening’s AFC and NFC championship games, which saw the hometown Vikings routed by the Philadephia Eagles. That loss ended the possibility for a first-ever home game Super Bowl.

Gametime ad touting concert tickets for 60% off prices at competing websites