Data Loading Tools fail to open after update to Pro 3.0.1

[CarolineChanEEC]

I'm working with the Lead Service Lines Solutions package and have added the dltsolutions package to my cloned environment. I recently updated my Pro to version 3.0.1. Now, when I try to open even of the tools in the toolbox, I get the error:

Tool has failed to open.

 'dlt.CreateDataLoadingWorkspace'

Error HRESULT E_FAIL has been returned from a call to a COM component.

The package appears to be correctly installed with no updates available.

[SepheFox1]

Same. I just upgraded from 2.8 to the latest version, which is 3.03. I haven't used the data loading toolbox before, but I just added it after the upgrade. Unable to use any of them, with the same error message you got.

[SepheFox1]

Oh never mind. I just needed to restart Pro after adding the toolbox, apparently. Well, maybe this will help others.

[GelisaJoseph]

If you restart ArcGIS Pro and this issue still appears then I would delete the cloned environment. Once the previous environment is deleted, I would complete the install toolbox steps again.