Ok, so, I had this error:
Error initializing database environment /
Users/s3v3n/Library/Application Support/
MintCoin! To recover, BACKUP THAT
DIRECTORY, then remove everything from it
except for wallet.dat.

 Here's what fixed it for me.

 I cleared the mint directory and then put the downloaded blk0001.dat and txlvldb folder along with my wallet.dat file in the mint directory and then fired it up. Worked like a charm.  

 Edit: Just to be clear, when I said I put the downloaded blk0001.dat and txlvldb folder, i am talking about the bootstrap download. All you need from it is those files,