enter image description here This message keeps on popping up again and again. I tried restarting my Mac and did no good. I thought it was steam causing these problems but deleting it did not make any difference.

Do you think this is a problem with MacOS Mojave? Please help me.

  • open the report and look where it says "process responsible .... it should be about 10-20 lines down – Ruskes Dec 14 '18 at 4:05
  • can you find that process SystemExtr in the Activity Monitor – Ruskes Dec 14 '18 at 4:20

No, this is not a problem with macOS Mojave. I've seen this before and it was caused by an app hiding within the Library folder.

Unfortunately I don't recall the app, but I do recall how we got to the bottom of it. In summary:

  1. Install EasyFind (it's free from the Mac App Store)
  2. Search for SystemExtr
  3. Identify the file (app) responsible
  4. Remove it

As mentioned, from memory it was sitting in the Library folder.

NOTE: I am in no way affiliated with EasyFind.


if you click on the report button you will see the location of SystemExtr. I had also the same problem and mine was located under ~/Library/SystemExtr so I removed the whole folder and it stopped to show up anymore.

  • what is it ? what app/process uses it ? I do not have it on High Sierra. – Ruskes Dec 14 '18 at 7:56
  • I don't know to be honest, I found this link and they think it is a malware.. although I cannot say. I think it is a new thing, so better keep an eye on the news in near future as it might be something else remaining on the system as well... – lowselfesteemsucks Dec 14 '18 at 9:27

You must log in to answer this question.

protected by Community Dec 16 '18 at 18:56

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

Would you like to answer one of these unanswered questions instead?

Not the answer you're looking for? Browse other questions tagged .