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I was digging around for fun, and found that my system.log was flooded with errors. Here is the output of sudo cat system.log | tail -8:

Mar 19 15:33:06 THE-COMPUTER parentalcontrolsd[113]: -[ActivityTracker appDidLaunchOrBecomeFront:launched:] [1844:ezra] -- Got an error when saving MOC: Error Domain=NSCocoaErrorDomain Code=259 UserInfo=0x34dd00 "The file “events.data” couldn’t be opened because it isn’t in the correct format."
Mar 19 15:33:57 THE-COMPUTER parentalcontrolsd[113]: -[ActivityTracker appDidLaunchOrBecomeFront:launched:] [1844:ezra] -- Got an error when saving MOC: Error Domain=NSCocoaErrorDomain Code=259 UserInfo=0x12a6d0 "The file “events.data” couldn’t be opened because it isn’t in the correct format."
Mar 19 15:34:02 THE-COMPUTER parentalcontrolsd[113]: -[ActivityTracker appDidLaunchOrBecomeFront:launched:] [1844:ezra] -- Got an error when saving MOC: Error Domain=NSCocoaErrorDomain Code=259 UserInfo=0x129b50 "The file “events.data” couldn’t be opened because it isn’t in the correct format."
Mar 19 15:34:17 THE-COMPUTER Safari[155]: __CFServiceControllerBeginPBSLoadForLocalizations timed out while talking to pbs
Mar 19 15:34:29 THE-COMPUTER parentalcontrolsd[113]: -[ActivityTracker saveData] [411:ezra] -- Got an error when saving MOC: Error Domain=NSCocoaErrorDomain Code=259 UserInfo=0x3451c0 "The file “events.data” couldn’t be opened because it isn’t in the correct format."
Mar 19 15:34:37 THE-COMPUTER parentalcontrolsd[113]: -[ActivityTracker appDidLaunchOrBecomeFront:launched:] [1844:ezra] -- Got an error when saving MOC: Error Domain=NSCocoaErrorDomain Code=259 UserInfo=0x3535d0 "The file “events.data” couldn’t be opened because it isn’t in the correct format."
Mar 19 15:34:42 THE-COMPUTER parentalcontrolsd[113]: -[ActivityTracker appDidLaunchOrBecomeFront:launched:] [1844:ezra] -- Got an error when saving MOC: Error Domain=NSCocoaErrorDomain Code=259 UserInfo=0x12bbb0 "The file “events.data” couldn’t be opened because it isn’t in the correct format."
Mar 19 15:35:56 THE-COMPUTER parentalcontrolsd[113]: -[ActivityTracker appDidLaunchOrBecomeFront:launched:] [1844:ezra] -- Got an error when saving MOC: Error Domain=NSCocoaErrorDomain Code=259 UserInfo=0x34aee0 "The file “events.data” couldn’t be opened because it isn’t in the correct format."

These seem to be messages from Parental Controls, but what do they mean? Also, they are going on all the time. Could anyone shed some light??

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It might help to know which OS X version you are talking about. –  Seth Noble Apr 18 '12 at 19:13
    
@SethNoble Snow Leopard (10.6.6) –  CoffeeRain Apr 19 '12 at 13:19
    
If possible, try updating to 10.6.8. I don't know if that will fix it, but it will at least provide a better baseline. –  Seth Noble Apr 19 '12 at 21:25
    
I have the same issue on 10.6.7. There are about 10 new messages per second. I can't even read my logs anymore. –  tkbx Nov 2 '12 at 18:00

2 Answers 2

There is a sandboxing error where the process responsible for writing log files is running into the inability to write those files.

Three things could help:

  1. Modifying your logging protocol to exclude that sender
  2. Turning off that part of parental controls
  3. Upgrading to a newer OS
  4. Filing a bug report with Apple to get the underlying logic error corrected.
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I had to remove the account with Parental Controls and stop using that feature. It became a CPU melter in my case. You may also want to upgrade to Mac OS X 10.6.8.

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