# Node-RED Modbus error

**URL:** <https://discourse.nodered.org/t/node-red-modbus-error/19808>\
**Category:** General\
**Created:** [2 January 2020 08:29 UTC](https://discourse.nodered.org/t/node-red-modbus-error/19808 "2020-01-02T08:29:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Unikumet](https://avatars.discourse-cdn.com/v4/letter/u/7ea924/32.png) [@Unikumet](https://discourse.nodered.org/u/Unikumet)\
**Post date:** [2 January 2020 08:29 UTC](https://discourse.nodered.org/t/node-red-modbus-error/19808/1 "2020-01-02T08:29:43Z")

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Hi,

I'm having issues deploying Node-RED after installing the latest Modbus package.  
I get up the error message: [modbus-write:e5900382.831fd] TypeError: Cannot read property 'registerForModbus' of null

Command prompt shows:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/2X/c/cf5aba5a1c2853bf23582f7484f454b6f0da21f4.png)

Does anyone know how to fix this?

Thank you in advance for any help.

-Alex

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<div class="post-metadata">

**Author:** ![Unikumet](https://avatars.discourse-cdn.com/v4/letter/u/7ea924/32.png) [@Unikumet](https://discourse.nodered.org/u/Unikumet)\
**Post date:** [2 January 2020 08:34 UTC](https://discourse.nodered.org/t/node-red-modbus-error/19808/2 "2020-01-02T08:34:41Z")

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Figured it out.

Had an invalid Modbus Read node active. Deleted the node, deployed the nodes, reset cmd and then it worked again properly.