Package Manager - Error

[m.manno]

Hello,

I’ve having some issue using the Package Manager on Rhino 8 SR19 (Rhino 8 SR19 2025-5-12 (Rhino 8, 8.19.25132.01001)

When I run the _PackageManager command the PackageManager Window pops up and it gives me this error:

Failed to fetch packages from source(s): “https://yak.rhino3d.com”
Object reference not set to an instance of an object.

Below the error in the Notification Tab

I’ve tried to turn off Window Firewall and the Antivirus with no luck.

Can someone help me with this?

[m.manno]

I finally found the solution to this error.

BullAnt manifest.yak was corrupted.

To solve the issue, I manually deleted the version folder of Bullant (25.5.27.8) and restart Rhino.

@geometrygym