# (Error)Node Red with sensortag and raspberry pi

**URL:** <https://discourse.nodered.org/t/error-node-red-with-sensortag-and-raspberry-pi/6084>\
**Category:** General\
**Created:** [23 December 2018 10:57 UTC](https://discourse.nodered.org/t/error-node-red-with-sensortag-and-raspberry-pi/6084 "2018-12-23T10:57:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rylccn](https://avatars.discourse-cdn.com/v4/letter/r/e0b2c6/32.png) [@rylccn](https://discourse.nodered.org/u/rylccn)\
**Post date:** [23 December 2018 10:57 UTC](https://discourse.nodered.org/t/error-node-red-with-sensortag-and-raspberry-pi/6084/1 "2018-12-23T10:57:20Z")

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I am trying to follow the instruction from [https://www.hackster.io/rei-vilo/sensortag-to-blynk-using-node-red-f90c4d](https://www.hackster.io/rei-vilo/sensortag-to-blynk-using-node-red-f90c4d)  
but the raspberry pi cannot detect the sensortag after node-red-start. I guess it is related to the following warning, how can I fix this? Please help! thank you

# Welcome to Node-RED

23 Dec 10:41:09 - [info] Node-RED version: v0.19.4  
23 Dec 10:41:09 - [info] Node.js version: v8.11.1  
23 Dec 10:41:09 - [info] Linux 4.14.90+ arm LE  
23 Dec 10:41:20 - [info] Loading palette nodes  
_**23 Dec 10:41:38 - [warn] ------------------------------------------------------**_  
_**23 Dec 10:41:38 - [warn] [node-red-node-sensortag/sensorTag] Error: Cannot find module '../build/Release/binding.node'**_  
_**23 Dec 10:41:38 - [warn] ------------------------------------------------------**_  
23 Dec 10:41:38 - [info] Settings file : /home/pi/.node-red/settings.js  
23 Dec 10:41:38 - [info] Context store : 'default' [module=memory]  
23 Dec 10:41:38 - [info] User directory : /home/pi/.node-red  
**_23 Dec 10:41:38 - [warn] Projects disabled : editorTheme.projects.enabled=false_**  
23 Dec 10:41:38 - [info] Flows file : /home/pi/.node-red/flows\_raspberrypi.json  
23 Dec 10:41:38 - [info] Creating new flow file  
23 Dec 10:41:38 - _**[warn]**_

_ **Your flow credentials file is encrypted using a system-generated key.** _  
_ **If the system-generated key is lost for any reason, your credentials** _  
_ **file will not be recoverable, you will have to delete it and re-enter** _  
_ **your credentials.** _  
_ **You should set your own key using the 'credentialSecret' option in** _  
_ **your settings file. Node-RED will then re-encrypt your credentials** _  
_ **file using your chosen key the next time you deploy a change.** _

23 Dec 10:41:38 - [info] Starting flows  
23 Dec 10:41:38 - [info] Started flows  
23 Dec 10:41:38 - [info] Server now running at [http://127.0.0.1:1880/](http://127.0.0.1:1880/)

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<div class="post-metadata">

**Author:** ![zenofmud](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/zenofmud/32/316_2.png) [@zenofmud](https://discourse.nodered.org/u/zenofmud)\
**Post date:** [23 December 2018 12:02 UTC](https://discourse.nodered.org/t/error-node-red-with-sensortag-and-raspberry-pi/6084/2 "2018-12-23T12:02:38Z")

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Did you notice this in the instructions:

### Install Additional Nodes

There are two releases for the **SensorTag** , `node-red-contrib-sensortag` and `node-red-node-sensortag` . I managed to get the first one to work.