The initial tutorial cannot be calculated

[miaozeya]

Hello dear blast foam development team and staff
May I ask why this error appears when I run some tutorials such as the building3D of blastfoam v6 in Ubuntu 20.04 and Openfoam-9? I simply calculated the given example without making any changes.

---

--> FOAM FATAL ERROR:
No mass was found in the domain

From function Foam::vector Foam::activationModel::centerOfMass(const volScalarField&) const
in file activationModels/activationModel/activationModel.C at line 458.

---