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Flow argument error: "Failed to deserialize argument"

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Posted on by ACC

Hi all,

I'm using the latest version of Power Automate Desktop (PAD version 2.27) on Windows 11.

I have a cloud flow that triggers and runs a desktop flow. I updated some of the input variables for the Desktop flow and am now receiving the following error (Image contains Error Details box with the error message: "Failed to deserialize argument data."):

When I try to run the desktop flow. I haven't come across this error before and I don't understand what could be the cause as there doesn't seem to be much documentation on it relevant to the current versions of PAD...

Any ideas on how I can resolve this error/what is causing it would be greatly appreciated!

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Power Automate Desktop

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Highboy 1,187 Super User 2024 Season 1 on at

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ACC 17 on at

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Thanks @Highboy - good find, unfortunately the resolution there seemed to be for the same error code but different issue.

I managed to resolve my issue in the meantime - as it turns out one the updated Array variables had an error in it's structure - interestingly it wasn't triggering an error with operations in PA Online, only when the variable was being called in Desktop.
Captivebird 50 on at

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The output of Claud Flow(office script to get the excel data) is in datatable type. e.g. [["XXX","XXX",...],[XXX,XXXX,...]].
I want to use this output as the input(datatable) for Desktop flow.
However, it throws an error "
"code": "FlowArgumentError",
"message": "Failed to deserialize argument data.
"
My question:
How can we fix this issue?
What is wrong with it?
Captivebird 50 on at

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Sorry, forgot to give you the screen shot of Input in Desktop flow
CU-19081228-9 on at

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@Highboy I am having a similar issue, what did you find as your reply is blank for me? Can you please reshare, if possible? Thanks.
Umaqsood 40 on at

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Hello, I'm facing a similar issue, I'm also passing a dataverse tbl to the Power Automate Desktop as an input Data table. Can you please help Identify how you fixed the Array Variable? I have shared the screenshots.
ACC 17 on at

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Hi @Umaqsood ,

I ended up checking the outputs of the array in PA Online and discovered that the output wasn't as expected. In my case I had an action creating an array from some variables earlier in the flow - these variables had an error from a function I updated, this error (rather than the correct value) was being passed through into my array. In my case, the earlier error wasn't showing up until the array (with the erroneous output from my variable) was passed to PA desktop.
Umaqsood 40 on at

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Thanks so much. You were right. I had a similar fix as well. My array had a faulty value. The solution is working fine now.
pvarma8 6 on at

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What is error, in the Array, I have similar issue, but i am unable to find out the error in JSON @Umaqsood @ACC
Umaqsood 40 on at

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@pvarma8 my array had null values.