Failed to create new virtual switch message when I try to create a new vSwitch

My company have an ESXi 6.5.0 Update 2 (Build 8294253) running on a lenovo customized image of an ESXi6.5u2 Vmkernel Release Build 8294253.

We are trying to create a new virtual switch and a new port group to this vswitch, but we have problems to do it. The ESXi shows an error message: Failed to create new virtual switch vSwitch1.

There is not other virtual switch with the same name on this server. There is a free network adapter linked to a separeted subnet. We need to install some virtual servers to this subnet.

Any idea to help me?

Thanks!