SpaceX has postponed the highly anticipated 10th test flight of its Starship rocket, minutes before liftoff, citing a ground systems issue.

The launch, scheduled for 7:30 p.m. EDT Sunday from the company’s Starbase facility in South Texas, was halted just 17 minutes before the window opened. “Standing down from today’s tenth flight of Starship to allow time to troubleshoot an issue with ground systems,” the company posted on X.

While SpaceX has not announced a new date, backup launch opportunities are available until August 26. The delay is the latest in a series of challenges for Starship, the world’s largest and most powerful rocket at over 400 feet tall.

Of the nine test flights so far, the last three this year ended in major failures — with explosions during Flight 7 and Flight 8, and disintegration upon reentry during Flight 9. Flight 10 was planned with design and operational upgrades following investigations into earlier mishaps.

Starship, consisting of the Super Heavy booster and upper-stage spacecraft, is fully reusable and central to SpaceX’s vision of returning humans to the Moon and eventually colonizing Mars. It is also slated to support NASA’s Artemis 3 mission, which aims to land astronauts on the lunar surface by 2026.