# OPCUA server initialization

**URL:** <https://discourse.nodered.org/t/opcua-server-initialization/58027>\
**Category:** Industrial\
**Created:** [9 February 2022 12:36 UTC](https://discourse.nodered.org/t/opcua-server-initialization/58027 "2022-02-09T12:36:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![FabioT](https://avatars.discourse-cdn.com/v4/letter/f/e495f1/32.png) [@FabioT](https://discourse.nodered.org/u/FabioT)\
**Post date:** [9 February 2022 12:36 UTC](https://discourse.nodered.org/t/opcua-server-initialization/58027/1 "2022-02-09T12:36:27Z")

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Hi All,  
I'm using node-red-contrib-opcua nodes to create an opcua server on my application.  
Sometime, during server initialization (when server struct is created) I have an error like "ns=1,s=FolderName already registered in namespace...".  
It seems that the old opcua instance is still running after a project deployment.  
I noticed that I have to create everytime the server struct at every project deployment,otherwise the struct is not created and the data not published ()ie server not working.  
I cannot understand what the reason is.  
Can anyone help me?  
Thank you  
Fabio

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**Author:** ![mikakaraila](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/mikakaraila/32/37496_2.png) [@mikakaraila](https://discourse.nodered.org/u/mikakaraila)\
**Post date:** [6 March 2022 19:51 UTC](https://discourse.nodered.org/t/opcua-server-initialization/58027/2 "2022-03-06T19:51:19Z")

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It depends what you deploy: Whole flow, modified flows or modified nodes.  
Of course if server is not deployed it is running with the folders and variables that you have already added.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [5 May 2022 19:51 UTC](https://discourse.nodered.org/t/opcua-server-initialization/58027/3 "2022-05-05T19:51:49Z")

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