When I try to partition my 2011 mac I get this error...

When I try to partition my 2011 mac I get this error "This operation couldn’t proceed because the target’s boot helper was mounted; you may want to try again." how can I fix this?

What are you partitioning, and what are you partitioning it for? Also "my 2011 Mac" doesn't help... Say whether its an iMac, MacBook Pro, or Mac Mini.

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