# Modbus Flex Write Error
**URL:** https://discourse.nodered.org/t/modbus-flex-write-error/58613
**Category:** General
**Tags:** modbus
**Created:** [18 February 2022 16:47 UTC](https://discourse.nodered.org/t/modbus-flex-write-error/58613 "2022-02-18T16:47:55Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@fedex03](https://discourse.nodered.org/u/fedex03)
#### Post date: [18 February 2022 16:47 UTC](https://discourse.nodered.org/t/modbus-flex-write-error/58613/1 "2022-02-18T16:47:55Z")
Hi there,
I'm working on a project that involves the Modbus Node.
Since I need to write several coil and register into a modbus server, I used the Modbus-Flex-Write node to collect every "write" message.
Unfortunately, I get this error:
> TypeError: Cannot read property 'getMachineState' of undefined
Anybody can help me to understand this error?
I see the modbus queue that grow up because something goes wrong.
Thanks for the help!
Best regards,
Federico
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [18 February 2022 17:07 UTC](https://discourse.nodered.org/t/modbus-flex-write-error/58613/2 "2022-02-18T17:07:26Z")
Are you sure it is coming from the modbus node?
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### Author:  [@fedex03](https://discourse.nodered.org/u/fedex03)
#### Post date: [21 February 2022 07:34 UTC](https://discourse.nodered.org/t/modbus-flex-write-error/58613/3 "2022-02-21T07:34:57Z")
> [@Colin](#):
>
> e it is coming from the modbus node?
Yes it comes from Modbus Write Node
I don't know what does it means, it seems something related to the server status.
From the catch node, I get this output
> TypeError: Cannot read property 'getMachineState' of undefined at Object.\_inputCallback (/opt/node-red/node\_modules/node-red-contrib-modbus/modbus/maps/modbus-flex-write.js:52:5) at Object.Node.\_emitInput (/opt/node-red/node\_modules/@node-red/runtime/lib/nodes/Node.js:199:18) at Immediate.\_onImmediate (/opt/node-red/node\_modules/@node-red/runtime/lib/nodes/Node.js:179:33) at processImmediate (internal/timers.js:439:21)
Any ideas?
Thank you
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [21 February 2022 08:24 UTC](https://discourse.nodered.org/t/modbus-flex-write-error/58613/4 "2022-02-21T08:24:40Z")
What version of node-red and nodejs are you using. For the latter, use
`node -v`
If that is V12, 14, or 16 then that should be ok. If you are using a recent version of node red then probably best to post an issue on the node's GitHub page.
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### Author:  [@fedex03](https://discourse.nodered.org/u/fedex03)
#### Post date: [21 February 2022 08:51 UTC](https://discourse.nodered.org/t/modbus-flex-write-error/58613/5 "2022-02-21T08:51:19Z")
My node-red version in "1.0.3: Maintenance Release"
This is an industrial device an I cannot access to command line to get the nodej version.
This kind of error could be related to the modbus server that does not offer the missing properties?
Thanks
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [21 February 2022 11:20 UTC](https://discourse.nodered.org/t/modbus-flex-write-error/58613/6 "2022-02-21T11:20:23Z")
Put an issue on the node's GitHub page, I think only the author can answer this.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [22 April 2022 11:21 UTC](https://discourse.nodered.org/t/modbus-flex-write-error/58613/7 "2022-04-22T11:21:14Z")
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