Upgrade Lion and Time Capsule problem

Good moorning
here my problem: after upgrade from snow leopard to lion it’s impossible to start any backup using Time Caspule base airport 1TB
this the error  message : Time Machine non può completare il backup.
Impossibile accedere all’immagine disco di backup “/Volumes/Data/I_Mac Anna .sparsebundle”  (errore-1)
It’s strange that I can start Time Machine and work on it but I can’t start any backup
the firmaware seems to be ok, I never had this problem before upgrade to lion, but I’m very  afraid because I’m going to buy a new Mac Book Air and I’ll ned Time caspule and its backups for starting data on the new machine
Who can help me? Tanks, Fiorini Giorgio

The coverage should be fine, since I get 4-reception-bars.
Sorry, I'm confused here. Is that what you "see" on your computer if the Express is powered down and you have your laptop at the location of the Express?
The "bars" are not a very accurate indicator of actual signal strength, and they tell you nothing about noise or other interference that you may be picking up in the new location.
I suggest that you download a utility like iStumber to get a more accurate picture of your network.
When you open iStumber, you'll see some general information about signal strength and noise on the network. You may be surprised to see that the signal is not as strong as you might have thought, but the most useful information is found under the Inspector in the Edit menu. Click Inspector.
Click the Samples tab and drag the lower right corner of the box out until you see the figures for Signal(dBm) and Noise (dBm). To get a SNR reading, or Signal to Noise Ratio, you would enter the Signal and subtract the Noise = SNR.
For example, lets say you see a signal of -60 dBm and noise of -90 dBm, so:
-60 dBm - (-90 dBm) = 30 dBm SNR
Then use the chart below provided by forum expert Tesserax to analyze the SNR on your network at the given location of your laptop:
o 40dB+ SNR = Excellent signal
o 25dB to 40dB SNR = Very good signal
o 15dB to 25dB SNR = Low signal
o 10dB to 15dB SNR = Very low signal
o 5dB to 10dB SNR = No signal
So, you would power down the AirPort Express temporarily and locate your laptop as close as possible to actual location of the AirPort Express and take some readings.
You would want to see a SNR reading of at least 25 dB at this location. Higher would be better because the Express can only "extend" what it receives. It does not "boost" the signal.
Please post on your results.

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