SpaceX's next trip to the International Space Station (ISS) is getting even more complicated as the launch will once again be delayed.

The commercial space company announced Monday, hours before the launch of its third ISS resupply mission, it would have to be pushed back to Friday. The launch of this resupply mission has already been delayed multiple times.

"Today's launch has been scrubbed due to a Helium leak on Falcon 9's first stage," SpaceX said in a statement on their website. "A fix will be implemented by the next launch opportunity on Friday April 18, though weather on that date isn't ideal. Check back here for updates."

According to Weather.com, thunderstorms are "possible" for Friday in Cape Canaveral, Fla., the planned launch site for SpaceX's Dragon spacecraft. Powered by a Falcon 9 rocket, SpaceX is overdue to deliver food, scientific equipment and other precious cargo to the ISS.

Among the cargo are pieces to replace a backup computer that malfunctioned a few days ago. However, Ralph Mastracchio and Steve Swanson, both NASA astronauts, will perform a spacewalk Tuesday to make the repair with or without SpaceX's delivery, the Associated Press reported.

If weather prevents the launch from taking off as planned Friday, the Dragon spacecraft will almost certainly reach the ISS after the spacewalk.

According to Space.com, SpaceX also intends to test its reusable rocket when it does eventually launch. In Oct., the company tested a Falcon 9 rocket with its own landing legs (video below), dubbed "the grasshopper." Officials said they are not expecting to land the rocket safely when comes back to Earth, but the test is just part of a future technology that could save billions of dollars.

Still, SpaceX's primary focus is to get the cargo to the ISS. This is the third of 12 resupply missions SpaceX will perform for NASA on a contract that pays the company $1.6 billion. NASA also has a similar contract with Orbital Sciences.

"The entire recovery of the first stage is entirely experimental," SpaceX vice president of mission assurance Hans Koenigsmann told reporters Sunday. "It has nothing to do with the primary mission here."

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