# Moving a map file with a landscape material causes issues

**URL:** <https://forums.unrealengine.com/t/moving-a-map-file-with-a-landscape-material-causes-issues/432119>\
**Category:** Asset Creation\
**Tags:** Map, unreal-engine, question\
**Created:** [August 21, 2018, 11:54am UTC](https://forums.unrealengine.com/t/moving-a-map-file-with-a-landscape-material-causes-issues/432119 "2018-08-21T11:54:25Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Superwig](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Superwig](https://forums.unrealengine.com/u/Superwig)\
**Post date:** [August 21, 2018, 11:54am UTC](https://forums.unrealengine.com/t/moving-a-map-file-with-a-landscape-material-causes-issues/432119/1 "2018-08-21T11:54:25Z")

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Seems to be an issue with the landscape material. Trying to move the file causes this error

Can’t save  
D:/Repos/MapError/BattleTank/Content/\_Levels/Battleground.umap:  
Graph is linked to private object(s)  
in an external package.  
External  
Object(s):  
LandscapeMaterialInstanceConstant\_6  
LandscapeMaterialInstanceConstant\_8  
LandscapeMaterialInstanceConstant\_4  
LandscapeMaterialInstanceConstant\_10  
Try to find the chain of references to  
that object (may take some time)?

Selecting yes fails to work and then continuing/cancelling causes the map to be corrupted and trying to load the moved file causes the editor to crash.  
A workaround is to move the file and then remove and readd the material (Or the other way around) in the landscape’s details before saving.

Repo for reproducing this [https://github.com/SuperWig/04\_BattleTank](https://github.com/SuperWig/04_BattleTank)

Edit: Appears to be UE-62150

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**Author:** ![Jeff\_A](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Jeff\_A](https://forums.unrealengine.com/u/Jeff_A)\
**Post date:** [August 21, 2018, 8:24pm UTC](https://forums.unrealengine.com/t/moving-a-map-file-with-a-landscape-material-causes-issues/432119/2 "2018-08-21T20:24:16Z")

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Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

[https://epicsupport.force.com/unrealengine/s/](https://epicsupport.force.com/unrealengine/s/)

Thanks

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**Author:** ![Superwig](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Superwig](https://forums.unrealengine.com/u/Superwig)\
**Post date:** [August 22, 2018, 8:55am UTC](https://forums.unrealengine.com/t/moving-a-map-file-with-a-landscape-material-causes-issues/432119/3 "2018-08-22T08:55:43Z")

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Oh I see it’s already there (UE-62150), though my post has additional information.

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**Author:** ![LuisAlaguna](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/luisalaguna/32/570408_2.png) [@LuisAlaguna](https://forums.unrealengine.com/u/LuisAlaguna)\
**Post date:** [February 5, 2019, 8:19am UTC](https://forums.unrealengine.com/t/moving-a-map-file-with-a-landscape-material-causes-issues/432119/4 "2019-02-05T08:19:12Z")

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I reviewed it and it is working right now.