Use of uninitialized value in concatenation (.) or string at C:\Program Files\MiKTeX 2.9\scripts\latexmk\perl\latexmk.pl line 1005.
Operator or semicolon missing before %O at (eval 12) line 1.
Ambiguous use of % resolved as operator % at (eval 12) line 1.
Operator or semicolon missing before %S at (eval 12) line 1.
Ambiguous use of % resolved as operator % at (eval 12) line 1.
Latexmk: Stopping because executing following code from command line
    -synctex=1 %O %S/
gave an error:
    syntax error at (eval 12) line 2, at EOF