smarty deprecation warnins

in backend error viewer :
Core: Error handler (FE): PHP Runtime Deprecation Notice: Function create_function() is deprecated in /usr/local/bioinfo/src/ng6_sources/ng6-V3.2.8/ui/nG6/res/smarty/libs/Smarty.class.php line 742
Core: Error handler (FE): PHP User Notice: function call 'assign_by_ref' is unknown or deprecated, use 'assignByRef' in /usr/local/bioinfo/src/ng6_sources/ng6-V3.2.8/ui/nG6/res/smarty/libs/sysplugins/smarty_internal_data.php line 79