# Node-red-contrib-iiot-opcua method caller node issue

**URL:** <https://discourse.nodered.org/t/node-red-contrib-iiot-opcua-method-caller-node-issue/7133>\
**Category:** Dashboard\
**Created:** [22 January 2019 09:20 UTC](https://discourse.nodered.org/t/node-red-contrib-iiot-opcua-method-caller-node-issue/7133 "2019-01-22T09:20:21Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![somnath](https://avatars.discourse-cdn.com/v4/letter/s/e8c25b/32.png) [@somnath](https://discourse.nodered.org/u/somnath)\
**Post date:** [22 January 2019 09:20 UTC](https://discourse.nodered.org/t/node-red-contrib-iiot-opcua-method-caller-node-issue/7133/1 "2019-01-22T09:20:21Z")

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Hi,

I am trying to setup a node-red flow where i am using "IIOT method caller" node for connection. My configuration seems OK but when i am passing Boolean input parameter which is acceptable parameter for my method then it is not working and giving error. But same method is called successfully through UaExpert client.  
Following is the error message that i am getting -  
**"Error: Invalid variant arrayType: Scalar dataType: Boolean value:true".**

Please help with the issue.

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:** [22 January 2019 10:21 UTC](https://discourse.nodered.org/t/node-red-contrib-iiot-opcua-method-caller-node-issue/7133/2 "2019-01-22T10:21:59Z")

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If you are sure what you are doing is correct, you should probably open an Issue against the node.  
As it is a contrib node, you should be able to find the nodes github page from the nodes page on [flows.nodered.org](http://flows.nodered.org)

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**Author:** ![somnath](https://avatars.discourse-cdn.com/v4/letter/s/e8c25b/32.png) [@somnath](https://discourse.nodered.org/u/somnath)\
**Post date:** [23 January 2019 04:02 UTC](https://discourse.nodered.org/t/node-red-contrib-iiot-opcua-method-caller-node-issue/7133/3 "2019-01-23T04:02:05Z")

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Ya sure i will do that. Thanks for reply.

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**Author:** ![evs96](https://avatars.discourse-cdn.com/v4/letter/e/58f4c7/32.png) [@evs96](https://discourse.nodered.org/u/evs96)\
**Post date:** [25 April 2022 09:10 UTC](https://discourse.nodered.org/t/node-red-contrib-iiot-opcua-method-caller-node-issue/7133/4 "2022-04-25T09:10:03Z")

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Hi, has this been resolved? I have the same issue as well. Thanks