Huge mac application launching error

Does it also happen in another, even temporarily created, user account?
Do you have any backups done before using MacKeeper (which is useless anyway)?

 

This is why you should be smarter than to install garbage like MacKeeper.

You don't need it. At all.

 

Uninstall MacKeeper following the instructions in the following link, using "MacKeeper", "zeobit" and "AntiVirus" as your search terms.

The most effective method for complete app removal is manual deletion:

Best way to FULLY DELETE a program​

You don't need "cleaner" or "maintenance" apps to keep your Mac running well, and some of these apps can do more harm than good. Some remove files/folders or unused languages or architectures, which does nothing more than free up some drive space, with the risk of deleting something important in the process.

These apps will not make your Mac run faster or more efficiently, since having stuff stored on a drive does not impact performance, unless you're running out of drive space. Some of these apps delete caches, which can hurt performance, rather than help it, since more system resources are used and performance suffers while each cache is being rebuilt.

Many of these tasks should only be done selectively to troubleshoot specific problems, not en masse as routine maintenance.

Mac OS X does a good job of taking care of itself, without the need for 3rd party software. Among other things, it has its own maintenance scripts that run silently in the background on a daily, weekly and monthly basis, without user intervention.

Five Mac maintenance myths​