Opening iTunes shows that an important itunes component has not been installed. Error code 42401 solution

Last night, I clicked upgrade from iTunes 11 to iTunes12. After that, I found that all kinds of iTunes 12 cards were unbearable. Then I pulled iTunes 12 to AppClear and installed iTunes 11, after the installation is complete, enable iTunes 11 and always prompt "install a required itunes component-42401". In the spirit of love, Baidu has a bit, and many results are the same as me, but no one provided a solution. Here, I have to boast about Google. Foreigners also encountered the same problem. I have a solution in the Apple support communities communication zone. If you have a good English proficiency, you can check it by yourself. It doesn't matter if you have a poor English proficiency, because I will teach you how to solve this problem, my Mac OSX version: 10.9.5. I have no backup version tutorial. Below are the necessary software:

 

Appzapper: http://www.appzapper.com (Name: apple-go Serial: APZP-103-97-215-111)

Pacifist: http://soft.macx.cn/2200.htm (trial available)

Apple support communities: https://discussions.apple.com/thread/6611544 (scientific Internet may be required)

 

 

Step 1: (if important files are saved in iTunes, back up iTunes Media in the Music/iTunes/directory );

1. Open Appzapper, and click AppZapper-> Preference in the upper left corner to deselect the 'keep Apple applications safe 'check box ';

2. Find iTunes in the Finder, drag it to Appzapper, click Zap, enter the administrator password, and delete it;

3. Music/iTunes/drag all the files into the recycle bin;

 

Step 2: (Pacifist must be used for reinstallation. Otherwise, an error will still be prompted when you enable iTunes)

1. Open Pacifist;

2. you can download iTunes. dmg is dragged to Pacifist, click <manual's content>, click install, and enter the password. During the installation process, a message is displayed, indicating whether to replace the original files. replace is selected ), after the installation is complete, you can open iTunes again, and the annoying error message will disappear;

 

If you want to restore the content in iTunes, take a closer look at this tutorial: http://www.pcadvisor.co.uk/news/audio/3415214/how-downgrade-itunes-11-itunes-10-in-mac-os-x/

 

Opening iTunes shows that an important itunes component has not been installed. Error code 42401 solution