Which famous product development flaw had to be fixed in orbit after the 1990 launch of the Hubble Space Telescope?

Space exploration and astronomy companies have developed unique brand identities and product development strategies to stand out in this specialized market. This trivia question tests your knowledge of a pivotal moment in astronomical product development history that changed how we view the universe. Think you know your astronomy tech development milestones?

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The primary mirror had a spherical aberration that caused blurry images
The solar panels failed to deploy properly, limiting power generation
The main computer system had incompatible software causing frequent shutdowns
The spectrograph instruments were calibrated for Earth's atmosphere instead of space