The Dragon spaceship may be leaking fuel, so it has been delayed.
In a statement, NASA said that it discovered "elevated vapor readings of mono-methyl hydrazine (MMH)", a volatile fuel used by the Dragon to adjust its altitude and attitude.
The cargo launch is on hold while they figure out the source of the leak.
The crew of the International Space Station were told by Houston that it will launch no earlier than June 28.
Since Russia launched its own cargo mission to the space station last week, the astronauts will not have to ration supplies any time soon.
NASA mission control told the International Space Station crew today that SpaceX's next cargo mission won’t launch before June 28, following a delay from this week to probe a possible fuel leak on the Dragon spacecraft.
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In the past, NASA has had to deal with fuel leaks.
The agency had to delay a "dress rehearsal" for its moon rocket launch due to a fuel leak.
The Cargo Dragon spaceship has delivered cargo into space before.
While the capsule won't carry any astronauts to the space station, NASA will likely want to get to the root of the leak prior to the company's next astronauts launch later this year.
It may be that some of the company's hardware is starting to show its age, even though it has made great strides in making rockets and spaceships more reuseable.
The Dragon Mission is on hold as astronauts conduct eye exams.
There are visitors on the outside of the space station.