# Build source code native2.41,but i get error in CesiumIonClient.lib

**URL:** <https://community.cesium.com/t/build-source-code-native2-41-but-i-get-error-in-cesiumionclient-lib/31790>\
**Category:** Cesium for Unreal\
**Created:** [April 29, 2024, 2:33am UTC](https://community.cesium.com/t/build-source-code-native2-41-but-i-get-error-in-cesiumionclient-lib/31790 "2024-04-29T02:33:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wanghao202105](https://avatars.discourse-cdn.com/v4/letter/w/f475e1/32.png) [@wanghao202105](https://community.cesium.com/u/wanghao202105)\
**Post date:** [April 29, 2024, 2:33am UTC](https://community.cesium.com/t/build-source-code-native2-41-but-i-get-error-in-cesiumionclient-lib/31790/1 "2024-04-29T02:33:05Z")

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the error:  
CesiumIonClient.lib(Connection.obj) : error LNK2019: unresolved external symbol \_Thrd\_sleep\_for referenced in function “void \_\_cdecl std::this\_thread::sleep\_for\<\_\_int64,struct std::ratio\<1,1000\> \>(class std::chrono::duration\<\_\_int64,struct std::ratio\<1,1000\> \> const &)” (??$sleep\_for@\_JU?$ratio@$00$0DOI@@std@@@this\_thread@std@@YAXAEBV?$duration@\_JU?$ratio@$00$0DOI@@std@@@chrono@1@@Z)

build with vs2022,ue version is 5.3

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<div class="post-metadata">

**Author:** ![IndigoYun](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/indigoyun/32/11245_2.png) [@IndigoYun](https://community.cesium.com/u/IndigoYun)\
**Post date:** [April 29, 2024, 3:13pm UTC](https://community.cesium.com/t/build-source-code-native2-41-but-i-get-error-in-cesiumionclient-lib/31790/2 "2024-04-29T15:13:40Z")

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Check your vs2022 installer ,maybe you installed two MSVC .