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please disable open_basedir from php settings. Jomsocial need to read external XML files for version checking.
if you don't know how to do it. please ask ther server support.
very difficult if hosting provider don't want give a hand at all.
can you ask the hosting support again about any clue or tutorial for php configurations setting for they server standard? your hosting must have this, because not all site can running with open basedir enabled.
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