# Problem with certificate file

**URL:** https://discourse.nodered.org/t/problem-with-certificate-file/12390
**Category:** General
**Created:** [19 June 2019 10:04 UTC](https://discourse.nodered.org/t/problem-with-certificate-file/12390 "2019-06-19T10:04:58Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![dongtuuyenblackpeony](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dongtuuyenblackpeony/32/9499_2.png) [@dongtuuyenblackpeony](https://discourse.nodered.org/u/dongtuuyenblackpeony)
#### Post date: [19 June 2019 10:04 UTC](https://discourse.nodered.org/t/problem-with-certificate-file/12390/1 "2019-06-19T10:04:58Z")

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Hi guys, new to the forum and I have been able to google some similar topics, but not find a concrete solution.

I am trying to use the IIOT-OPCUA client from the Contrib library, but get this error:

cannot locate certificate file C:\Users\xxx.node-red\node\_modules\node-opcua-client\certificates\client\_selfsigned\_cert\_1024.pem

It there a missing package from installing the node? I have the folder but no certificate

Thanks

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### Author: ![ukmoose](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/ukmoose/32/13_2.png) [@ukmoose](https://discourse.nodered.org/u/ukmoose)
#### Post date: [19 June 2019 10:36 UTC](https://discourse.nodered.org/t/problem-with-certificate-file/12390/2 "2019-06-19T10:36:05Z")

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as per this thread you need to provide your self signed certificate. [Error: Cannot locate certificate file](https://discourse.nodered.org/t/error-cannot-locate-certificate-file/9232/4)