Reported by Junaid Ali: http://markmail.org/message/xefxgs76dco43cwx
VMware.pm::capture is calling $self->vmhost_os->append_text_file. When SSH isn't available, $self->vmhost_os is an instance of vSphere_SDK.pm. This module does not implement an append_text_file subroutine.
It may not be possible or worthwhile to implement such a subroutine in vSphere_SDK.pm as I think the file would need to be retrieved, appended, then copied back. Instead, a $self->vmhost_os->can('append_text_file') should be added to the caller.