Error code 4 all docs created with CC 2018

None of these suggestions have worked for me. I have cleared the cache in Library, reset preferences, rebooted — nothing. Needless to say, given I JUST finished my project and now I can’t open it, I’m pretty peeved. If anyone has any other suggestions, I’d love to hear them! Otherwise, I guess I’m starting over. 

Read through the 74 messages on this topic. I have same issue and need a fix. But, to help with some of the comments (and hopefully, Adobe), I can say that Cloud storage/working on a cloud/Google Drive/working over a network isn't the issue as I work with all files/apps stored on my MacBook Pro and still have this issue regularly.

In regards to a professional replacement for peace of mind with deadlines and clients, hang in there: Affinity just released a beta of Affinity Publisher and the commercial final should be out this year (hopefully).

I've had the same issue almost daily recently. I only updated to High Sierra from Sierra fairly recently. Quitting InDesign and relaunching has always allowed me to open the file. However I have also recently had a similar error on trying to save a file or create a new one. So I had to quit without saving... which is a bit more alarming. I work on both an internal and external SSD, both in and outside of Dropbox. No pattern I've noticed so far. There has also been issue with Photoshop presenting the save as dialogue when the file has already been saved. Then counting to present save as every time.

ME TOO!! IT'S INCREDIBLY ANNOYING... It also happens when trying to create a new document - although I think then it becomes an error code '0'

Adobe, please fix this bug!

I have been having the same problem with my book file.

It first started with "Error 5".

After trying basically every thing that I could find on other threads like this one, I ended not being able to recover my file and had to pay a company (www.markzware.com) to be able to recover my book file. It costed me $64 for them to analyze the .indd file and make sure they could recover it + $140 to finally recover it. They ended up being quick and did the work in less than an hour but still.... A total of CAD$240 to recover my file that was not actually damaged. It's expensive.

Then I decided to start over a new file, to make sure that doesn't happen again plus I made sure to check all of the little things I've read that might actually cause InDesign file to go corrupt:

* Corrupt Font(s) (or corrupt font caches)

* Corrupt Image(s)

* Power Failure

* Placing images via drag-and-drop from an Internet page

* Copying and Pasting Images from Word, PowerPoint, etc into InDesign

* Copying and Pasting text from Word, PowerPoint, etc into InDesign

* Working on an InDesign file over a network or on a remote server

After I save my file and opened it again (the new file) it sais Error 4. File doesn't want to open anymore.   ‍♀️

I have cleared the cache, delete Adobe InDesign, re-installed it. Restart my computer. And now I was able to open it again....

And here I am. I am scared now of closing Adobe. This is ridiculous. I've spent my entire day trying to figure this out.

Hope this can help some of you guys.

Just got this error again (after updating Indesign a few days ago). So the new Indesign update didn't fix this problem...

I have this same issue myself - I have had the Adobe Creative suite for 10 years but the recent iCloud pay in instalments has been nothing but trouble.

This new Indesign is painfully slow - it crashes and jams regularly  - and now tonight after closing down - what I believed was properly last night - I get this Error Code 4 message - This is an entire book - I am not only worried - I am deeply upset.

Does anyone have any suggestions?

It is happening to me too. Quitting Adobe CC and then a restart works but that is incredibly inconvenient. Buying the latest greatest Macs and keeping CC up-to-date should be enough.

Urgh. This started for me today even though CC2018 has been installed for some time now.
Frustrating.