Hi,
Your error message indicates you are using a geoprocessing package created in ArcMap (`c:\temp\examplemodel.gpk`). If that's the case, then note you only need to enable the `ArcMapGeoprocessing` package deployment option (rather than ArcMap and Pro).
The first step I always recommend is to disable the deployment of the Local Server components completely which will force your app to use the full Local Server SDK installation (typically in `C:\Program Files (x86)\ArcGIS SDKs\LocalServer100.X`). To do this:
1. Open the deployment file and ensure both the top level Pro and ArcMap options are set to false e.g.
```
...
<Package id="Pro" name="ArcGIS Pro Compatible Server" enabled="false">
...
<Package id="ArcMap" name="ArcMap Compatible Server" enabled="false">
...
```
2. Run a clean and build on your solution and ensure the `LocalServer100.X` folder has been deleted from your project output location (e.g. `bin\debug`).
3. Now run your application (at least until you see the developer license message box).
4. If you want to double-check where LocalServer is running from: start Task Manager, switch to the Details tab, sort alphabetically by Name, find the `RuntimeLocalServer.exe` process, right-click, and choose `Open file location`. This should now be e.g. `C:\Program Files (x86)\ArcGIS SDKs\LocalServer100.5\64\bin`.
The steps above will confirm if this is a simple deployment issue (i.e. you have not selected all options required) or if there is a potential problem with your geoprocessing package.
Cheers
Mike