When you are trying to delete a virtual machine from VMware Cloud Director UI you across the error.
An error occurred during the initialization.VMware Cloud Director 10.6.0
This is a known issue affecting VMware Cloud Director 10.x.
Currently, there is no permanent resolution.
WORKAROUND:
To resolve the issue currently, when the 'Error: An error occurred during the initialization.' pops up click on RETRY option to delete the VM from the VMware Cloud Director UI.