[Solved] Container can’t be split because one of more of its volumes is not mounted

student010101 Asks: Container can’t be split because one of more of its volumes is not mounted
I’m running MacOS 10.15.7. I’m in disk utility trying to partition my hard drive. When I click on partition, I see the below:


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What does this mean, and how do I mount the volume?

I already repaired all my stuff using disk utility.

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