Installation and server related problems

I installed joomla 2.5 because i need this h5p things. i did the order in the intallation guide page. But when i view the article it gets an error as

Undefined property: stdClass::$itemid in C:\xampp\htdocs\coco\plugins\content\h5p\h5p.php on line 59.

i am testing  in xammp . And where should i put  h5p flashcards and drag and drop examples?  i'm new to h5p and can you help me for this to be solved?

I made a couple of tests of installing XAMPP with H5P on a USB stick, but it did not work, when moving from PC to PC. Checking the errors I found out that the errors might be related to the Bitnami Windows installer and not the XAMPP or the H5P installation itself. So I thought this might work if I do the installation using none og the Bitnami installers and installed it all more "manually". It looks like this procedure is now working.