# Error opening node red in cmd

**URL:** <https://discourse.nodered.org/t/error-opening-node-red-in-cmd/32635>\
**Category:** General\
**Created:** [9 September 2020 10:03 UTC](https://discourse.nodered.org/t/error-opening-node-red-in-cmd/32635 "2020-09-09T10:03:35Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![vishalk](https://avatars.discourse-cdn.com/v4/letter/v/b9e5f3/32.png) [@vishalk](https://discourse.nodered.org/u/vishalk)\
**Post date:** [9 September 2020 10:03 UTC](https://discourse.nodered.org/t/error-opening-node-red-in-cmd/32635/1 "2020-09-09T10:03:35Z")

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Hello,

I am not able to open node red, I am using node red since 2 weeks.but, this error is contineously running in command promt when I type node-red to start node red.

9 Sep 11:58:12 - [error] [opc-da server:c97c3198.e3a6] Error: 4112 - Unknown error!  
9 Sep 11:58:12 - [warn] [opc-da server:c97c3198.e3a6] Trying to reconnect...

Please help somone what to get rid of this error

Vishal

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**Author:** ![knolleary](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/knolleary/32/3_2.png) [@knolleary](https://discourse.nodered.org/u/knolleary)\
**Post date:** [9 September 2020 10:14 UTC](https://discourse.nodered.org/t/error-opening-node-red-in-cmd/32635/2 "2020-09-09T10:14:52Z")

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> [@vishalk](#):
>
> opc-da server

The error is coming from an `opc-da server` node you have in your flows.

You need to either fix the configuration of that node or, if you don't want it, remove the node entirely. It sounds like a Config node, so open up the Configuration Nodes sidebar and search for it in there.

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**Author:** ![vishalk](https://avatars.discourse-cdn.com/v4/letter/v/b9e5f3/32.png) [@vishalk](https://discourse.nodered.org/u/vishalk)\
**Post date:** [9 September 2020 10:52 UTC](https://discourse.nodered.org/t/error-opening-node-red-in-cmd/32635/3 "2020-09-09T10:52:03Z")

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Thanks for reply

but,I am not able to open the node red. because in cmd only this error is keep on occuring.  
How can I stop this error in cmd and open node red ?

if there any way to delete this from library from node red, please tell

Vishal

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [9 September 2020 14:08 UTC](https://discourse.nodered.org/t/error-opening-node-red-in-cmd/32635/4 "2020-09-09T14:08:03Z")

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If you run  
`node-red --safe`  
it will start the editor but not run the flows. If that doesn't work then please post the full startup log here. Use the `</>` button when pasting it in.

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**Author:** ![vishalk](https://avatars.discourse-cdn.com/v4/letter/v/b9e5f3/32.png) [@vishalk](https://discourse.nodered.org/u/vishalk)\
**Post date:** [10 September 2020 09:00 UTC](https://discourse.nodered.org/t/error-opening-node-red-in-cmd/32635/5 "2020-09-10T09:00:12Z")

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Thanks, bur I already uninstalled and then reinsatlled the node red . Though I had my flows, there are lot of changes I had to do with respect to UI and even many graphs are not working . I am still doing changes.

Earlier I was using OPCUa read , now its not working I have to use subscrible to read the data and now sampling rate is very slow 6-7 data per second with subscribe in OPCUa. with another OPCUA node for another controller, read is working, so I am little confused.

Vishal

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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:** [9 November 2020 09:00 UTC](https://discourse.nodered.org/t/error-opening-node-red-in-cmd/32635/6 "2020-11-09T09:00:14Z")

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