Error when using the apply asset package tool

[PilarPerez]

Hi everyone, I am trying to apply an asset package to a gdb with the utility model, however I am getting this error.
Migrating my files to the asset package did not have any problems.
Can anyone guide me where to check to solve this error?

Thanks in advance

[MikeMillerGIS]

Are you trying to apply to an existing UN that an Asset Package was already applied to?  I see you have a map in your project, can you try with a project with no maps?  What version of ArcGIS Pro?

[BogdanHristozov]

I was getting the same error before, but after updating the Esri Utility Network Package Tools (untools) it went away. Currently I have version 3.1.1, but I see there is a newer version - 3.2. You can try to update the package to see if the error will disappear.

[GavinMcGhie]

Perhaps a bit late to answer, but... If I recall correctly, I got this error when I added a new custom Asset Type value and integer simply because the integer I chose was already in use in the domains. I picked a new integer for the custom AT that was far outside the range in use, reloaded the AP, and then I was able to apply AP.