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Get changes for an item or file failure - unknown error

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Posted on by Charlie_W

Hi,

I am getting really stuck on an issue with the 'Get changes for an item or file' block in one of my flows. I have used this several times before without issue but for some reason this flow is failing on this part.

To note: I have versioning opted in on my Sharepoint list already

The error message i'm getting is 'Unable to process template language expressions in action 'Get_changes_for_an_item_or_a_file_(properties_only)' inputs at line '0' and column '0': 'The template language function 'int' was invoked with a parameter that is not valid. The value cannot be converted to the target type.'.'

In my Get changes for an item or file block i have it set up as follows

The 'since' expression is set as

sub(int(triggerOutputs()?['body/{VersionNumber}']), 1)

I've used this many times before without issue and have confirmed that the Version number is being included in the outputs of each flow run.

So i'm a little confused as to why i'm seeing this error now?

Any help on this would be much appreciated

Thanks

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Building flows

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ManishSolanki 15,091 Super User 2025 Season 2 on at

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Hi @Charlie_W

Pls verify if you are getting decimal or period in version number.

If this helps & solves your problem, please remember to give a 👍 and accept my solution as it will help others in the future.

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Charlie_W 4 on at

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Hi @ManishSolanki

My version number does include a decimal.
This seems to be the case with all my flows that include this action without having any issue though?

I tried recreating the first few steps in a new flow and it worked this time but I am really confused as to why this Flow is failing, would be great to understand this so to avoid having to rebuild Flows in the future

thanks
Charlie

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