Cannot download this application, please verify you internet connection

I try to download and install lion from App store but i have this error message ''Cannot download this application, please verify you internet connection''
1- I already did the last update on my snow leopard
2- I have a macbook with duo core
3- my internet connection works well ,
What I should do ? I install lion on my macbook pro and it works well. Why It's doesn't work on my macbook
thx
Martin

I can access the internet just fine in the browser and i can use any other app i have.
Sent from my Verizon Wireless 4G LTE DROID

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