Try turning on debug output (in site.ini for your siteaccess, see the default site.ini for info). Often this output makes tracing problems very easy, although this isn't always the case! You should clear all caches again also when you change this setting. The 'clearcache.sh --clear-all' command line method of clearing the cache seems to be more reliable than the web admin method, by the way.
Thanks everyone for help me. I've found the problem. I had a wrong database configuration (be precise a wrong name of database). The problem was really silly but those fatal errors misguide me.
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