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The Expression is Invalid - POST Method for creating a site page

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Posted on by LukeSykes

I'm attempting to build a flow that creates site page when a list item is created.

I'm following a tutorial however when I try to use the following expression in the Uri box under 'Send an HTTP request to SharePoint' it tells me the expression is invalid, even though it works for the guy in the tutorial.

_api/web/getfilebyserverrelativeurl('/sites/SPFx/SitePages/OpportunityTemplate.aspx')/copyto('/sites/SPFx/SitePages/@{triggerbody()?['Title']}.aspx')

Create SharePoint Site Pages automatically with Power Automate - YouTube

9:00 minutes

Can anyone see what i'm doing wrong?

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Building flows

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Expiscornovus 33,175 Most Valuable Professional on at

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Re: The Expression is Invalid - POST Method for creating a site page

Hi @LukeSykes,

Did you copy/paste the value into the expression editor?

If so, can you try directly copy pasting your value into the Uri field instead? Because of the at-sign and curly brackets in front of the title reference it should be aware that this part is an actual expression/dynamic content field.

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LukeSykes on at

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Re: The Expression is Invalid - POST Method for creating a site page

Hi There

I did exactly that when it didnt work in the expression box, then followed the rest of the tutorial, the error I now get is this

Server relative urls must start with SPWeb.ServerRelativeUrl
clientRequestId: 78c2cc34-23a6-49a4-8ce8-0df9b4ce4926
serviceRequestId: 401543a0-f053-4000-46d1-e46df259e539

but I cant see where to input that

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