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Tips can manually disable start-up item on Mac In order to fixĮrror 254 with this problem, it is necessary to do a check for the list of log-in items, and delete the ones which haven't been used in currently, and it is also suggested to disable the ones which don't need to be launch automatically on Mac. #Mac disk utility restore failure could not validate source codePrograms listed on the start-up items are all the applications that will launch automatically when booting up the system, invalid or useless start-up items on the list will cause the OS X cannot help you to activate the associated programs with success, so the error code will display to report this problem on the PC. Restart the application and check whether it can operate smoothly without error 254.Open Preferences folder in the Library, and locate the preferences related to the problematic app, and then select to remove them to the Trash.Type "/Library/" in the box, and press the Return key. ![]() Click on Go on the top menu, select "Go to Folder.".So, preference file issue is a very general issue with the error 254, to fix error 254 in this case, you should clean the associated preferences files, and restart the related program or feature to see if it can behave normally. In this case, useless files will accumulate in the Library, and cause many issues and problems on the computer. Many common Mac users would choose to uninstall a program via the Trash, but this program removal method generally cause many preferences files of the program cannot be cleaned well on the Mac. Corrupted or overloaded preferences files on the Mac computer can easily cause the computer itself or some other applications cannot operate effectively and normally, and the error 254 will thus be triggered and trouble you. Preference is a type of file on the Mac that store the rules or parameters which aims at telling the applications about how they should work on the device. ![]() If you get the error 254 with such a program problem, in order to fix error 254 well, please firstly go to uninstall the app thoroughly on your PC, and then you can consider to reinstall it if the app is supported to use on your OS X. What's more, a corrupted program issue will also cause the operating error on the Mac. #Mac disk utility restore failure could not validate source installProgram installation often has a particular requirement for the operation system, when a program is installed on an OS which actually does not support this specific program, errors will be triggered when you install the application. How can troubleshoot and fix error 254 well on Mac Uninstall the program which cause the error So you should take the following instant measures to get rid of the error issue on your PC. If this error issue stay on the Mac for a long time and still cannot be resolved, you will find more and more troubles and problems when using the computer.
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