[Libguestfs] virt-sparsify error message.

Hello, I'm using virt-sparsify on a new server and I get an error message: # virt-sparsify img img2 [   0.0] Create overlay file in /tmp to protect source disk [   0.1] Examine source disk virt-sparsify: error: libguestfs error: guestfs_launch failed. This usually means the libguestfs appliance failed to start or crashed. Here is libguestfs-test-tool output: http://pastebin.com/3EZNxAeR I would really appreciate any help or hint Thanks in advance.