Problem with Time Machine

I am getting the following error message in my Imac

Time Machine could not complete the backup.
"The backup disk image “/Volumes/Juan F. Perez's Time Capsu/Macintosh.sparsebundle” could not be accessed (error -1)"

I have an IMac
Mac OS X
Version 10.7.5

In Finder I see:
Shared
Juan F. Perez's Time Capsule

When I click on this I see the following

Name:
Macintosh.sparsebundle

Date Modified:
Yesterday 9:32 P.M.

Size
--

Kind
Sparse Disk Image Bundle

Date Added
--

Can any one help me to fix this problem?

Thanks