Thank you, Kaushik Solanki.
However, the file runs perfectly in my laptop computer, in which I have QlikView Personal License.
When I put a copy of this file into the computer with AccessPoint, I get the referred error. It should be noticed that the computer with AccessPoint has more RAM that the laptop computer.
Besides, other files that used to work in the same computer with AccessPoint (some of them demanded much more memory than the file I am trying to use) are now returning the same "No connection error", so I don't understand what can be causing this issue now.
Do you have any more suggestions?