PlugIn Build folder Error

I'm in the middle of upgrading a PlugIn from 2017 to 2021.

This one works well in version2017.
When I finish upgrading to version2021
And Build it, it emits following Error:

Please specify a deployment path in "PluginDeploymentPath" property
(e.g Studio 2019 -> C:\Users\[currentUser]\AppData\Roaming\SDL\SDL Trados Studio\15\Plugins)

Fortunately, I have assigned my proper build location already, like this.

Poperties pane > Build > Output > output path:
C:\Users\user\AppData\Roaming\SDL\SDL Trados Studio\16\Plugins\Packages\

How can I solve this Error ?

added screenshot
[edited by: Kelly Edward at 5:45 PM (GMT 1) on 16 Apr 2022]