ArcGIS namespaces not found

[Daniel4]

Hi Everybody, I inherits a visual studio ArcGIS project from an old collega. but when I open up the project in VS, it cant not find the ArcGIS namespaces. 

It showing this:

And this:

In my Extension manager I have install this:

I am using VS 2019 and the ArcGIS Project are used in AGP 2.9.

I do not have any problems creating new AGP projects in VS. 

What am I missing?

[StephenRhea_NV5]

Do you have Pro installed on your machine? The SDK will pull in references from the Pro installation path unless you're using the ArcGIS Pro Extensions NuGet package (https://www.nuget.org/packages/Esri.ArcGISPro.Extensions)

[Daniel4]

I have Pro 2.9 installed. 

[Wolf · Accepted solution]

To support ArcGIS Pro 2.9 you need to install and use Visual Studio 2019.   Follow these steps to resolve the assembly path issue:

FAQ · Esri/arcgis-pro-sdk Wiki (github.com)

[Daniel4]

Great 🙂 Everything looks so pretty now.