you are right ... it seams it was a simple transfer-error via sftp and Total Commander. I am to old for IT - I guess Or the NSA is manipulating sftp connections After copying it a second time - all is working well.
I used Serendipity Version 1.5 before und copied all Files from 1.7.4 over the current files. But after copy the files the site no longer working and these errors came up:
Notice: Undefined property: Smarty::$secure_dir in /home/www/bundled-libs/Smarty/libs/Smarty.class.php on line 702 ...