calender calculating in work center error

when calculating forward.calender is not available after 01/01/13 for work center xx how i solve this proplem

i see i dynamic it calculate until 31/12/12 but 01/01/13 no calculating how i make it calculating after 01/01/13


Run Report 99001046-Calculate Work Center Calendar with Work Center and Starting Date and Ending Date as 010113, 311213

OK thanks