I'm glad you get rid of the problem , but Boris Is right there must be something in your report which causes the problem.
Maybe you use a DE Class ?
The report should work fine also without any Tables in its DE and in your case it would be the best "setup"

>Alessio if I select the option Private Data Session on my report and add the table in the data environment it works fine!!!!
>
>Thankyou for your help