Problems with exporting my video. "Error code 39"

I changed the export location and that helped me with this issue. 

Did you try exporting to a different format, like ProRes, of which you can then make h.264 transcodes using something like Shuttle Encoder:

https://www.shutterencoder.com/en/

Same.  I have spent HOURS on one video and cannot get it.  The first time it exported and uploaded but there was no sound.  Now it will not even finish exporting.  It shows 100% and then flips to an error.  I have watched all kind of YouTube videos for help.  Why does my video play fine on premier pro after editing, but not export and play?  So frustrating.  Any ideas?

Update... it worked! The video has successfully uploaded with no error 39 message. Once again... no adjustments were made to the export settings. The solution is to either save the video to a different drive, or free up more space on the drive.

So I've been getting this message as well with a recent video that I've been trying to export. I have it as an HEVC (H.265) however, so h.264 isn't the problem. What I have discovered is that my hard drive is near full capacity with only 116 GB available (before exporting the over 1 hour long 5K video) and I just didn't realize that my hard drive was that full before. I'm no expert, but I read one time that in order for premiere pro to export a video successfully, it needs double the space on the drive that it's exporting to then what the finished video would be. My finished video is going to be slightly over 60 GB... I only have 116 GB of space available... there it is.

When Premiere Pro exports a video it needs space on the hard drive that it's exporting the video onto... or so I've read in the past. I haven't had this problem in a while... I've used Premiere Pro for 3 straight years on a nearly daily basis, but I do recall running into this issue before thinking something more serious was going on when in all reality, I just needed to clear up space on my hard drive, or write the video to an external hard drive so that there is enough space for Premiere Pro to work with.

So... With that said... I'm using an external hard drive with 2.6 TB of free space. That should do the trick. 3% done at the moment, so I'll have to check 7 hours from now as this project is massive in size. By the way, you guys should try exporting in H.265 rather than H.264. Videos get exported a lot quicker that way. I've done it successfully at H.265 for a few months on multiple videos at this point at 5k 60fps so I really don't feel like that's the issue.

Once again, try checking your available space on the drive that you're wanting to save the finished video on. It's possible that the recent updates have forced Premiere Pro to require more available space on the drive that you're saving the file to... but... I really don't know if that's true or not since I'm not an expert... but I am experienced and I feel really confident that this is the issue that many of you are facing. Others have reported that selecting a different drive has solved the problem for them, and I'd be dumbfounded if that didn't solve the problem for me. If you don't have a seperate drive to save a project on, or if you can't free up some space on your computer, then I suggest to invest in an external hard drive for any situation like this that you come across in the future. Plus, if you're going to be editing a lot of video in the long term, an external hard drive can be very usefull.

Not sure if anyone is still having this issue, but I found that I was getting the error only when exporting with "Match Source-Adaptive High Bitrate" selected. I was able to successfully export my project by just selecting "High Quality 1080p HD." Hope this helps if anyone's still having trouble!

h.264 is good for phones and memory sticks and YT does fine with them, but ProRes is a much better editing format and it is considered 

'visually lossless' so you get better quality from it also at the expense of bigger file sizes. I use ProRes LT or even Proxy finding the quality good for me and the file sizes are not a massive.

h.264 compresses really well, thus it is used on phones, drones, etc. But they tax the computer much more than ProRes and they are a lossy format. 

Hey. Please forgive me for I'm still learning Premiere Pro. You said you cleared the cache, and then it worked. What exactly do you mean by that and how do you do it?

Good going @Mafost .

YouTube will take ProRes files, and I've heard the end file that people see turns out better than when using h.264. 

I uploaded one a few months ago for an old client, in ProRes, and it looks pretty good. I used some 3/4" footage from c1984 - transfered to ProRes and upscaled and tweaked by Topaz Video AI. And then some stock footage.

https://youtu.be/JfVjLcl0gXE

ProRes is considered to be 'visually lossless' and it's really easy on the editing system. So, you get good performance, while editing.

Try the export again in ProRes, if you have time. This time on the Format, select "QuickTime" rather than the MXF OP1a version you used. Then on the Preset, select either Apple ProRes 422 LT (or Proxy - for a smaller file size)

Thanks for the advice: Clearing the media cache and switching to software encoding works. Having said that, H.264 seems a lousy codec for VR video. Is there anyone out there who can give me the best settings for exporting VR video? I have a 35min video and I need a reasonable file size (right now, I have 17 GB with mp4 format and H.264 codec, but the res is lousy, compared to the original GoPro raw footage)