There is no fluid volume in the project

Giron

Hello

When I start the simulation or just create mesh I have the message: "There is no fluid volume in the project. Please check geometry or boundary conditions."

It's an external analysis type with conduction, radiation and free air cooling. I often make this type of simulation and I was never obtained this message.

Remark: -If I run this model in internal analysis type with heat conduction in solids only it's OK.

- I check geometry and I have:

"Analysis type: External" "The fluid volume is 0 m^3" "The solid volume is 0,06264 m^3"

Thanks in advance for any help!