error when setting the VM disk bandwidth on Virtualbox 4.0.4

[ning_wisc]

Hi there,

I am trying to test the "limit disk bandwidth" function. I followed the instructions in the user manual to first create a bandwidth group, then attach the disk image to the bandwidth group. However, i got the following error when I try to re-start the VM.

Code: Select all

Failed to open a session for the virtual machine guest1.
Unknown error creating VM (VERR_GENERAL_FAILURE).

Result Code:  NS_ERROR_FAILURE (0x80004005)
Component:  Console
Interface: IConsole {515e8e8d-f932-4d8e-9f32-79a52aead882}

I detach the disk image first, then attach it with bandwidth group, then fails as above. Also, I tried not to detach the disk image and directly add it into the bandwidth group, it also fails.

Did I do something wrong ?

Thanks,

Ning