# Energy Meter -Voltage/Frequency value read =49.16

**URL:** <https://discourse.nodered.org/t/energy-meter-voltage-frequency-value-read-49-16/21497>\
**Category:** General\
**Created:** [10 February 2020 12:43 UTC](https://discourse.nodered.org/t/energy-meter-voltage-frequency-value-read-49-16/21497 "2020-02-10T12:43:32Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Sandip86](https://avatars.discourse-cdn.com/v4/letter/s/b3f665/32.png) [@Sandip86](https://discourse.nodered.org/u/Sandip86)\
**Post date:** [10 February 2020 12:43 UTC](https://discourse.nodered.org/t/energy-meter-voltage-frequency-value-read-49-16/21497/1 "2020-02-10T12:43:33Z")

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I want the read the Data from Energy meter - frequency using the USB Port.& create the .CSV File  
Flow  
[12.txt](https://discourse.nodered.org/uploads/short-url/mmkHL0JmKk6X2OM9gjaQjbmFAPA.txt) (341 Bytes)

but node-red showing the error.

 ![Untitled](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/8/a/8a924f5c03d7f56214d80220632eab237b73e978.png)

Please help for this issue.

BR,  
Sandip

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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:** [10 February 2020 13:48 UTC](https://discourse.nodered.org/t/energy-meter-voltage-frequency-value-read-49-16/21497/2 "2020-02-10T13:48:33Z")

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Have you been using postgredb with node-red?  
From the Hamburger menu select Configuration Nodes and see if you have any unused nodes. If so open them and click Delete button to get rid of them.

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**Author:** ![Paul-Reed](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/paul-reed/32/66906_2.png) [@Paul-Reed](https://discourse.nodered.org/u/Paul-Reed)\
**Post date:** [10 February 2020 14:42 UTC](https://discourse.nodered.org/t/energy-meter-voltage-frequency-value-read-49-16/21497/3 "2020-02-10T14:42:41Z")

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Hey @Sandip86  
Have you just imported the flow?  
If so, the flow maybe using the [node-red-contrib-re-postgres](https://flows.nodered.org/node/node-red-contrib-re-postgres) node, which you maybe don't have installed in your system.

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**Author:** ![pcmvanveen](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/pcmvanveen/32/16373_2.png) [@pcmvanveen](https://discourse.nodered.org/u/pcmvanveen)\
**Post date:** [10 February 2020 16:10 UTC](https://discourse.nodered.org/t/energy-meter-voltage-frequency-value-read-49-16/21497/4 "2020-02-10T16:10:34Z")

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Disable postgress and stop the nodejs server (no restart).  
When the server is down start it so it can load the required modules.

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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:** [10 April 2020 12:50 UTC](https://discourse.nodered.org/t/energy-meter-voltage-frequency-value-read-49-16/21497/5 "2020-04-10T12:50:44Z")

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