[TYPO3-english] $dataStructArray['ROOT'] error

[Progetto uno]

Hello,
I moved my web site created with typo3 from one server to another, all right, but I do not see the images. Html generated miss all the references to the images in / typo3temp

The error is that the array $ dataStructArray ['ROOT'] passed to the function does not have this value.

Is there any particular configuration to be done?

Thank you