Unity constantly "Importing (iteration)" problem

Last night I was working on a canvas image and all the sudden I started having this pop up saying "Importing (iteration)" pop up after every change I do. I never seen or heard of this happening before and it constantly takes a couple seconds to save. It pop's up if I make any changes to my scene, adjust anything in the inspector or or do pretty much anything including saving a project.

Does anyone know how to fix this issue?

The current version of unity I'm using is 2019.3.0a10

Here is an image of what keeps popping up

 

I updated to 2019.3.b1 and told it to import the project I am currently working on. It does appear to be doing things, but it has been importing now for 4 or 5 hours and is on iteration 220!! This has never been an issue before.

 

I ended the task after 244 iterations. Deleted the Library and have reopened it. Hopefully it works now.

 

Ran into this today on b3 so it's still around.

Wasn't even a project upgrade, project was already running on b3.

I just did a manual re-import on the shadergraph asmdef and the importer keep iterating indefinitely.

 

I too face this issue at right now. I can't open my main project. Anyone suggest to me prevent from this issue, Anybody share the best practice of importing assets "importing iteration 2" loading issue.

 

This issue is still there on 2019.3 b6. I can't open my main project as well. Deleting the Library folder temporarily fixed my issue; I was then able to open Unity, but opening a shadergraph caused a crash. I am now back to the "importing iteration 2," as Unity reimports and re-imports my shadergraphs.

Has anyone made any further progress?

 

Opening an already upgraded project on 2019.3.0b8 and this is still an issue. It was ok at first, but after sitting for a few minutes it started flashing the "Importing (iteration 2)" dialogue every second or so. I had to record it on my phone's slow motion camera to even read it.

 

Tried to force quit from Task Manager, then reopened and got the "Importing (iteration 2)" dialogue as soon as the project opened. Still flickering quickly.

 

Probably should post this in the 2019.3 beta forum instead of here, since anyone from Unity looking for threads on pre-release 2019.3 issues will not be looking in this forum for them.

 

I have the exact same problem as op, even just changing the size of a Text mesh pro triggers this annoying popup to show.

 

I have the same issue , Did anyone knwo how to fix it ? It's lower the working efficency .....

 

I fixed it by deleting and re-importing the package that caused the issue. I think I had to import them one by one rather then in a package.

 

Hi,I also encountered the same problem, and later found that there was a call to the "PlayerPrefs.DeleteAll ();" method. After blocking this function, "constant Importing (iteration)" did not occur,But I don't know the specific reason.

 

HI,This problem was discovered suddenly, and it took a lot of time to find it, because there were no errors or warnings. No any problem in previous use ...

 

Is this documented anywhere? I assume the issue is using PlayerPrefs from within

OnValidate

functions etc?

 

I meant more the "PlayerPrefs.DeleteAll()" during asset importing causing the import iteration loop; I misunderstood your previous post, thinking you meant that it causing the loop was intended / by design.

 

I encountered a similar problem when working in a prefab. it kept showing an asset progress importing popup for just a sec every time i did anything. It turned out it was the autosave on that prefab. Even though the popup shows a different prefab. i just turned auto save off and it seemed to fix it. Hope someone finds this useful

 

I just upgraded to the release version of 2019.3.0f6 and when opening my project I'm getting this, importing (iteration 3) at the moment.

The project is big. will this iterate more times? is it intended behaviour? or should I end the process and open the project again.

Edit. I did just that and now it only imported once.

 

hey, did anyone figure out how to solve this problem? I just downloaded Unity 2019.3.0f6 and I'm having this same Asset Import iteration problem!

 

@JeffDUnity3D I think I found the cause of this problem - at least why it's happening in the project I'm currently working on. We are using Addressables and we call PlayerPrefs.DeleteAll() when the user starts a New Game. This tedious importing start basically every time I go to play mode and it's doing importing for minutes!
But I found out that Addressables 1.6.0 saves info into the PlayerPrefs:

BuildScriptFastMode.cs
BuildScriptPackedPlayMode.cs
BuildScriptVirtualMode.cs
AddressablesImpl.cs

I found that in the Build.. files the Addressables.kAddressablesRuntimeDataPath is set to a value and the AddressableImpl uses this value. If I just start the game without starting a New Game no importing happens on next start so it's very suspicious. And if I start a new game there is importing on the next start.

I found another file in the com.unity.render-pipelines.universal@7.1.6:
MaterialPostprocessor.cs

This one gets a key which is the 'curUpgradeVersion' and if that doesn't equal to 'lwrpVersion' it does AssetDatabase.ImportAsset() calls.

You can find the problematic parts in the files by searching for PlayerPrefs.

 

I Found the problem / Problems that are causing this
Normally SteamVR and OculusVR integrations has an option that autoenables it for you
so when you are trying to uninstall your Standalone VR plugins
you have to uncheck "Virtual Reality Supported" in player settings first

But then you realize that it enables automatically so you can not disable it
this is the main problem when you are triying to uninstall VR Standalone plugins

there are a few steps you must follow firts before deleting them
and i will show you what to do;

Disabling oculus "Use required project settings"
I have it unchecked already (but you will see a tick)



Disabling SteamVR "Auto Enable VR" in SteamVR_Settings ScriptableObject
You can find it by searching SteamVR_Settings in project window




And then you should be able to Disable "Virtual Reality Supported"
And it will not auto reenable again!



Then you will be able to uninstall the standalone VR packages correctly
And then Install the New plugins from XR Management window



YAY! FIXED!

 

I had recently downloaded the PlayMaker equivalent of this and forgot to de-link them after testing. Thank you very much for this post!

 

I'm going to try this after I back up my project...

 

I am having this same problem. But I don't use VR at all. And I'm not using PlayerPrefs.DeleteAll() function anywhere in my project either.

I am upgrading my project from a previous version to Unity 2019.3.3f1. My project is very large in size, and I've been letting my computer import for about 12 hours now, and it's still going through iterations. One screen said 1 out of 3723 and I think it goes through 10 iterations for each of these 3723 items...... that's A LOT of importing and could probably take all year, literally

Anyways, if anyone knows why it's doing this or a fix for it, it would be great.

Going on 13 hours and it's still importing lol.

 

Thats another bug that was fixed in unity 2019.3.5f1
Updating to the last version should fix that

 

That would be great. I hope so. Thank you.

 

Iteration(version 2) importing window constanly showing up in my old project. Unity version2019.3.13

 

For me the same, after installing new Unity Hub 2.3.2 and Unity 2019.3.14 on Windows 10 Home

 

After a few reinstallations of the Unity engine, I realized that it would not help and I've solved in the following way:
- completely removed all the Unity versions and UnityHub;
- manually removed all the files on my PC which are somehow connected to the Unity or UnityHub;
- with the help of utility like CCleaner cleaned up garbage and registry;
- reboot the computer and install everything again;
It works now.

 

I just switched back to asset version 1.
And there is no Disturbing windows pop up at the center of the screen.
But it is deprecated.
If this thing will not be fixed I do not know how one can work on any intermediate project in asset version 2...

 

Ran into this endless iteration loop. an entire day pissed away and continues! Why is this issue still present in 2019.4?

 

I've found another reason for this. I'm using NordVPN and when this app is active (so I'm connected to the VPN server) Unity doesn't start (endless splash screen).

 

That is different issue.

 

I had this issue as well. In my case, simply disabling auto-save for the prefab fixed it.

 

I had a custom editor script which in the OnEnable was calculating some values to save, and setting the prefab dirty. This was fine on 2018.4 but on 2019.4.2 would cause an infinite loop of trying to load/import the prefab. My workaround for now is just to comment out where it set the prefab dirty in the editor's OnEnable until I find a different way to implement it.

 

So Why is there no response from unity on this issue... Upgrading project to The newest LTS causes this never ending loop of importing iterations... Every time unity compiles this happens... What Do we do?? Any ideas?? WE can always go back to the version before trying the 2019.4 LTS but man why is this always a mess... Thanks in advance for any help

 

Change asset database type to version 1 in settings.
There still be some flashings, but no awful and disturbing progress pup-up at the center of the screen.

 

Thank you a lot! This fixed it for me to!

 

How did you switch to the asset database version 1? I only see version 2 with no option to switch (Unity 2020.1.3f1).

 

Version 1 is deprecated and no longer available for selection in Unity versions past 2019.4.

 

The issue is still happening on 2019.4.9, despite being marked as resolved.

 

That is different issue.

 

Hi, I'm using Unity 2020.1.5f1 and this issue is still happening:

I'm on Windows. I opened my project from Unity Hub. The previous project version was 2019.2.17 I clicked the new version and opened the project. After hours of " Importing (iteration x) (busy for xx:xx)... " it opens but the scene is all PINK and all the files have a loading icon (I can't open any prefab nor folder).

I tried on Mac and the importing from 2019 to 2020 is successful so I pushed the correct project on GitHub, pulled the new project version to Windows but when opening it, infinite hours of importing and ends with PINK scene.

so all is fine on Mac but not on Windows.

How can I solve this?

 

Wow, glad I found this thread. At least now I know I'm not the only one suffering here. I am on 2019.4.5f1 and just deleting a whitespace character and saving the file in a shader throws up "Importing (iteration 2)" for about a whole solid minute.

Has anyone found any effective way around this? Going to asset db 1 isn't an option, and I'm not seeing any of the above stuff in my project.

I'm debating investing a ton of time in figuring out a way to separate code editing from unity so I only have to live through this "importing" crap once an hour or so instead of on every file save.

 

I got the same issue, found that this "Importing widow" goes away much faster if I disable this checkbox:
Edit > Project Settings > Editor > Asynchronous Shader Compilation
This is quite puzzling, because on 2019.1 it was faster compiling shaders with this checkbox enabled.

 

what version are you on? im on 2020.1 or something like that mabye try to contact the unity team themselves becuse i dont think your C# code has an error or ur computer i think its just unity