Something is wrong with the XAMPP installation :-(

I write as bellow, but not read;

the error report is here:

[15-Apr-2015 15:26:20 Europe/Berlin] PHP Warning: file_get_contents(lang.tmp): failed to open stream: No such file or directory in C:\xampp\htdocs\xampp\index.php on line 2

I don't know how to fix it.
Any help will be greatly appreciated!