Problem with mobile site

Hi, I have problem with mobile version of my site. When I load the site on mobile device, appear a fatal error. I precise that the same error is not present on PC. I have checked also the activated plugins for any incompatibility problems. I have only 2 plugins activated, over those present in theme and Akismet. The first one is "Admin Menu Editor". It is a plugin that manage and simplify the backend of WP menu. If necessary, I can disable it, but I would prefer to avoid doing so. The second one is Weepie Cookie Allow.  It is a plugin to manage the EU cookie law. This plugin at the moment is not working and I wait for support from the author. I think that it has problem of compatibility with the theme.  Anyhow I tried to deactivate the plugin, but the problem is always present on mobile theme. At last I note that if I disable in the section "Mobile" of the WP backend the button ‘Activate Mobile’, suddenly the mobile theme works fine. But that it's really strange. What's wrong? Could you help me? In the following post my website. Thanks for all. Piero