Web Reference: I'm guessing you're running version 0.99, in which case you'll need to either use a slightly different syntax or update to a more recent version of matplotlib. If you're running version 0.99, try doing this instead of using using the projection keyword argument: Jul 17, 2025 · Learn to fix the common Matplotlib error "unknown projection '3d'" in Python using clear, step-by-step solutions for building accurate and interactive 3D plots. Nov 6, 2024 · A: The error usually arises from using an outdated version of Matplotlib that doesn’t support the ‘3d’ projection. Updating to the latest version or ensuring proper imports can resolve this issue.
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