# Android error CD0 Constructor (UMG/paper2d files?)

**URL:** <https://forums.unrealengine.com/t/android-error-cd0-constructor-umg-paper2d-files/307378>\
**Category:** Mobile\
**Tags:** constructors, unreal-engine, Android, Packaging, question, Blueprint\
**Created:** [February 18, 2015, 11:50pm UTC](https://forums.unrealengine.com/t/android-error-cd0-constructor-umg-paper2d-files/307378 "2015-02-18T23:50:03Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hultaj](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@hultaj](https://forums.unrealengine.com/u/hultaj)\
**Post date:** [February 18, 2015, 11:50pm UTC](https://forums.unrealengine.com/t/android-error-cd0-constructor-umg-paper2d-files/307378/1 "2015-02-18T23:50:03Z")

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Hello,

To be specific:  
1.What happend:  
My Android blueprint-only game was working perfectly in editor and on android device. After package .obb file had 700+mb. I wanted to resize .obb so I deleted:  
-. a lot of starter content I didn’t used (textures, materials, meshes, audio etc.),  
-. paper2d folder because I didn’t used it.  
After that my game stopped working on device and I got some paper2d errors during engine start.

1. How I tried to fix that:

- Disable paper2d plugin in editor - didn’t helped.
- Upgrade engine from ver. 4.7 preview 5 to 4.7 preview 8 - didn’t helped.
- Backup my project content files on HDD, reinstall UE4, create new blank blueprint project and copy my project content files into that new project - didn’t helped.

1. What is going on now?

- game still work perfectly in editor viewport and mobile preview,
- game work perfectly after launch for windows,
- game can be package without problems to Android apk.obb.
- after instalation apk/obb on device I got “[title] has stopped working” or something like that,
- after “launch on android” from editor I got a lot of error CD0 Constructor:  
**Here is screenshots from error window from device:**  
[UE4 Android launch errors - Album on Imgur](http://imgur.com/a/9aqWB)

What I can see in error window - game didn’t work because some engine umg/paper2d files are not cooked/packaged.  
I have no idea why this stopped working and how to fix that.

Please help, I spend already about 17h on this problem and still no solution:(

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**Author:** ![hultaj](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@hultaj](https://forums.unrealengine.com/u/hultaj)\
**Post date:** [February 20, 2015, 4:57pm UTC](https://forums.unrealengine.com/t/android-error-cd0-constructor-umg-paper2d-files/307378/2 "2015-02-20T16:57:15Z")

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Problem fixed. It was a lot of work, but game work now on mobile device.  
To fix errors (look screenshots up) I changed default fonts to my content fonts in project settings-\>general settings, and I choosed my own materials in paper2d settings. After that I didn’t had errors, but I had crash on start:D  
To fix that I was packaging game not into apk+obb, but apk only (obb included inside). After that game works perfectly on device. Because of using only .apk my .apk was way to large. I resized my .apk from 700+mb to 45,4mb:) Just by deleting not used assets, starter content, removing engine files from content/slate except Docking folder (just for build, after package I moved them back there) and resizing my textures.

I’m leaving this post to help someone who will meet same problems.

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**Author:** ![Fenra](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fenra](https://forums.unrealengine.com/u/Fenra)\
**Post date:** [March 10, 2015, 4:03pm UTC](https://forums.unrealengine.com/t/android-error-cd0-constructor-umg-paper2d-files/307378/3 "2015-03-10T16:03:01Z")

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![33454-launchconfig.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/e/f/0/ef09eaf669286aff0e85f8852b33b37c808e9a3d.png)

I had the exact same error messages as you, and changing the launch options seemed to fix it.

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**Author:** ![anonymous\_user\_40d11edc](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_40d11edc](https://forums.unrealengine.com/u/anonymous_user_40d11edc)\
**Post date:** [April 1, 2016, 8:51am UTC](https://forums.unrealengine.com/t/android-error-cd0-constructor-umg-paper2d-files/307378/4 "2016-04-01T08:51:59Z")

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I have the same problem,but I solved it. My solution is delete all the files of UE4 project on my android device,than reset the phone,good luck!