Assertion failed, Please contact the product vendor!

[levitation]

I got the message below.

Additional info: It occurred after I was trying to delete some snapshots and got various error messages like access denied and invalid object state. I do not know if these errors were related. This time also my harddisk was getting full and eventually the machine refused even to show up in the VirtualBox window.

Just for additinal note, the snapshot delete functionality currently quite often fails, even when disk has enough room. The failures look random - same snapshot always fails, but which ones will fail and which ones will not for same virtual machine, is not predictable.

Assertion failed: [m->state == MediumState_LockedRead] at 'F:\tinderbox\win-5.0\src\VBox\Main\src-server\MediumImpl.cpp' (4411) in long __cdecl Medium::i_createDiffStorage(class ComObjPtr<class Medium> &,enum __MIDL___MIDL_itf_VirtualBox_0000_0000_0074,class MediumLockList *,class ComObjPtr<class Progress> *,bool).
Please contact the product vendor!.


Result Code: 
E_FAIL (0x80004005)
Component: 
MediumWrap
Interface: 
IMedium {4afe423b-43e0-e9d0-82e8-ceb307940dda}