I have a new vSphere 7.0U1 farm and new Nakivo server setup.
I tried to backup VM on ESXI host, I got the following error message. All backup jobs got the same error.
Local reseller already helped to upgrade Nakivo to 10.1.1 (build 49573 from 2020 Nov Sat at 12:11:00 PM) but the result is still same.
VMware vSphere Storage API error has occurred on the "Onboard transporter" transporter.