Please disable the error reporting by adding these two lines at the beginning of your suitecrm index.php file,
ini_set(‘display_errors’,0);
error_reporting(0);
Above lines will hide these notice/warnings/error from UI.
@Note, for these Notices/errors/warnings
PHP provides various levels of feedback to developers in the form of notices, warnings and on occasion errors. Some of these can be ignored and are only used to inform programmers of best practices (and violations there of) and others.
So better to hide these warnings by turning off error reporting.
Also changes done in index.php does not need to be repair & rebuild .
It will reflect in suitecrm even without repair & rebuild.