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SFP question

I have two 9222i fiber switches.  I am using single mode fiber between them.  I have been having problems with a link on them. I keep getting this error

FCP WEARNING: MAC Bit error exceeded threshold – kernel

I looked it up and found that it is usually a physical problem.  Is that correct?  Also what is the best SFP I should use for this link.  I want to buy new ones.           

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