# OPC Client DA/UA Class not registered

**URL:** <https://community.factoryio.com/t/opc-client-da-ua-class-not-registered/1492>\
**Category:** Drivers\
**Created:** [May 11, 2022, 9:46am UTC](https://community.factoryio.com/t/opc-client-da-ua-class-not-registered/1492 "2022-05-11T09:46:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jdevoo](https://dub1.discourse-cdn.com/flex017/user_avatar/community.factoryio.com/jdevoo/32/84_2.png) [@jdevoo](https://community.factoryio.com/u/jdevoo)\
**Post date:** [May 11, 2022, 9:46am UTC](https://community.factoryio.com/t/opc-client-da-ua-class-not-registered/1492/1 "2022-05-11T09:46:22Z")

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Hello,  
I have recently re-installed Factory IO version v2.5.1 on Windows 10 x64

I was going to look at UPC-UA but it threw an error.  
Retrieving the COM class factory for component with CLSID {} failed due to the following error: 80040154 Class not registered.

I can’t recall if I am supposed to install and additional component.  
TIA  
JP

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<div class="post-metadata">

**Author:** ![brunovgr](https://dub1.discourse-cdn.com/flex017/user_avatar/community.factoryio.com/brunovgr/32/12_2.png) [@brunovgr](https://community.factoryio.com/u/brunovgr)\
**Post date:** [May 12, 2022, 8:41am UTC](https://community.factoryio.com/t/opc-client-da-ua-class-not-registered/1492/2 "2022-05-12T08:41:42Z")

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Hi,

I suspect this error occurs when FIO is trying to browse for OPC DA servers.  
Error code 0x80040154 indicates that a DCOM component is not properly registered on Windows.  
Do you have an OPC DA server installed on your computer?