# I got this while playing with mods installed. not sure what to do about this

**URL:** <https://discourse.stonehearth.net/t/i-got-this-while-playing-with-mods-installed-not-sure-what-to-do-about-this/28985>\
**Category:** Other Reports\
**Tags:** caused\_by\_mod\
**Created:** [March 3, 2017, 7:30pm UTC](https://discourse.stonehearth.net/t/i-got-this-while-playing-with-mods-installed-not-sure-what-to-do-about-this/28985 "2017-03-03T19:30:30Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![8BitCrab](https://sea2.discourse-cdn.com/flex022/user_avatar/discourse.stonehearth.net/8bitcrab/32/48512_2.png) [@8BitCrab](https://discourse.stonehearth.net/u/8BitCrab)\
**Post date:** [March 19, 2017, 12:57am UTC](https://discourse.stonehearth.net/t/i-got-this-while-playing-with-mods-installed-not-sure-what-to-do-about-this/28985/2 "2017-03-19T00:57:03Z")

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hey there @Kitkat_Matt, the error is definitely the cause of the mod “[stonehearth expanded](https://discourse.stonehearth.net/t/mods-great-coltinis-great-mods-v0-16-the-fine-update/27401)” as can be seen on that first line,

c++ exception: **‘stonehearth\_expanded’** has no alias named ‘monster\_tuning:undead:scaled\_undead\_zombie’ in the manifest.

> [@Kitkat\_Matt](#):
>
> Also i’m having issues with high Astar use and not sure if there’s a real fix for it or not. i have my hearthlings in a fairly small contained area so they don’t have a massive amount of room to expand on and while building something they tend to lag, a lot, like i have to pause the game so idle is 99% then as soon as i unpause they go back to working but only for a few seconds at a time and lag again. is there a fix for this yet?

this might be fixed with the newest “unstable” releases as i know that the team got a bunch of pathfinding optimizations done.

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