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(com.apple.quicklook[3854]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook. How do I switch to XPC or Bootstrap?

My log message says "(com.apple.quicklook[3854]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook" How do I do this?

VIN, MacBook Pro (13-inch Mid 2010), iOS 10.2, macOS Sierra version10.12.2

Posted on Jan 4, 2017 9:44 AM

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Posted on Apr 19, 2017 7:38 PM

Same error in the logs on 10.12.X. I have done a clean install of 10.12.3 and then 10.12.4 after wiping my harddisk so this error isn't related to the migration of preference and data from old Mac build.


This is very much in the vanilla OS and Apple should be clarifying if it relates to an issue. I have been on these forums trying to find answers as my MBP 15" Late 2016 crashes every few days and Apple support doesn't have any solution.


If older APIs are used that's used by Apple supplied programs in the current version of the OS - 10.12.4. I see this error before almost all the crashes on my MBP 15".

16 replies

(com.apple.quicklook[3854]): Endpoint has been activated through legacy launch(3) APIs. Please switch to XPC or bootstrap_check_in(): com.apple.quicklook. How do I switch to XPC or Bootstrap?

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