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I downloaded this Sonic the Hedgehog model on Sketchfab.com, and I'm trying to rig this model, but I keep getting the same error message.

The error I'm seeing is:

Bone Heat Weighting: Failed to find solution for one or more bones

I also don't know how to connect his parts so the model can be rigged.

My blend file

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You have a lot of overlapping vertices, in Edit mode select all and press M to Merge by Distance

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