[Koha] Acquisition module Error 500

Dear Friends, I working with Koha 3.02 Acquisition module. I created a vendor and basket. I got the error message " An error has occured. Error 500" when i added a new order for books. I have not filled the item information (barcode and related information) in the order space. But mew order placed. When i entered item information for another new order, two order for same book created. Whats the wrong with acquisition module? -- Vimal Kumar V. Mahatma Gandhi University Library Kottayam, Kerala- 686 560 Web: http://www.vimalkumar.co.nr Blog: http://vimalkumar.oksociety.in --------------------------------------------------------------------------- "I forget what I was taught. I only remember what I have learnt" -Patrick White