Problem with Acronis True Image Home 2011

Hello experts,
I find a weird problem on Acronis true Image Home 2011. The software refuses to remove a backup or generate an Incremental Backup. What should I do? Please help. Thanks in advance.
Error
Failed to open data stream.
More information about this error and solutions may be available online in the Acronis Knowledge Base.
To access the online resource manually, enter the event code at: https://kb.acronis.com/errorcode
Event code: 0x000B03E9
