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Hi Rabin,
Could you maybe provide a little more detail.
What version of Umbraco?
Is it a new instance or have you upgraded from a previous version?
At what point are you getting this error?
Hi Huw,
My Umbraco version is 11.1.0 and The error message occurs when is select any of the listed properties ( textarea , block grid), this problem is occur after upgrade project from v11.0.0 to v11.1.0
Have you tried deleting any temp folders etc. Could be a caching problem.
I had a 'Sequence contains more than one matching element' issue when I upgraded one of my projects recently but this was to do with the Forms module.
Perhaps the answer provided to me may help you in some way though.
https://our.umbraco.com/forum/using-umbraco-and-getting-started/110214-issue-with-umbraco-forms-after-upgrade-of-site-to-v1021
For anyone still looking for a solution, I have posted some notes on how I resolved this error in my situation in case it helps anyone.
https://our.umbraco.com/forum/using-umbraco-and-getting-started/109541-throws-an-error-while-adding-a-property-in-a-document-type#comment-344355
You can also get this error when selecting a plugin with the same alias in the package.manifest file.
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Sequence contains more than one matching element
Hi Rabin,
Could you maybe provide a little more detail.
What version of Umbraco?
Is it a new instance or have you upgraded from a previous version?
At what point are you getting this error?
Hi Huw,
My Umbraco version is 11.1.0 and The error message occurs when is select any of the listed properties ( textarea , block grid), this problem is occur after upgrade project from v11.0.0 to v11.1.0
Have you tried deleting any temp folders etc. Could be a caching problem.
I had a 'Sequence contains more than one matching element' issue when I upgraded one of my projects recently but this was to do with the Forms module.
Perhaps the answer provided to me may help you in some way though.
https://our.umbraco.com/forum/using-umbraco-and-getting-started/110214-issue-with-umbraco-forms-after-upgrade-of-site-to-v1021
For anyone still looking for a solution, I have posted some notes on how I resolved this error in my situation in case it helps anyone.
https://our.umbraco.com/forum/using-umbraco-and-getting-started/109541-throws-an-error-while-adding-a-property-in-a-document-type#comment-344355
You can also get this error when selecting a plugin with the same alias in the package.manifest file.
is working on a reply...