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Can not load map, failed to load assets

Hello and good day,

I have a huge problem and I hope anyone can help me with this urgent issue, I would really appreciate it. It would save me weeks of work.

The problem is as follows, today we had a power outage in my apartment building. I was thinking to my self, luckily there is an autosave function with this engine or else I have big problems. But as it turns out, when I loaded up my project when the electricity came back on there was an error in my project.

Everything loads fine, except for the level I was working on. It does not load, nothing happens when I left click with my mouse. But if I right click with my mouse, there is an error message that states: Failed to load assets. I click to see the error message, but there is nothing! This is really frustrating because I worked over a week on this level. Thou I have saved several times and the engine also autosaves.

Any help would be greatly appreciated.

Product Version: UE 4.19
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asked Dec 07 '18 at 01:47 PM in Using UE4

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1 answer: sort voted first

Try this:
- Duplicate the project (as to not lose any important changes).
- In the new project, delete "Intermediate" and "Saved" folders.
- Open new project and see if the map can be opened.

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answered Dec 07 '18 at 02:33 PM

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avatar image Sophic Dec 07 '18 at 02:45 PM

Thank you for your help, I will try this and let you know of the progress.

avatar image Sophic Dec 07 '18 at 03:25 PM

Unfortunately, when I open the project I get a message stating: Failed to open map file. This is most likely because the map was saved with a newer version of the engine.

Then I try to open the level, but the same happened as before.

avatar image Weibye Dec 07 '18 at 03:31 PM

the map was saved with a newer version of the engine.

Is there any reason why you can't simply migrate the entire project to the new engine version that the map was created in?

Unreal doesn't like the combination of new assets with old engines, so if you create a blueprint or map in version 4.20 and try using those in 4.18, you won't be able to open them.

Solution is to only create assets within the engine version you have decided on using, and only ever upgrade engine versions.

avatar image Sophic Dec 08 '18 at 06:39 AM

Thank you for your suggestion @Weibye The problem is that the map was made in the same engine version. That is why it is so strange. I even migrated the map to a clean project in the same engine version. Still the same issue, and no error logs! This is crazy, but I could re-make the whole level from memory. But I waste so much time, and the error still stands.

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