[Koha] issues problem

i have problem when i issues one books out it said "Too many issues (already issued / max : c 0 / 0)", but i know i have one books available that can be issues How do you handle those data? do i need to open the issues tag? thanks for the help _________________________________________________________________ Don’t just search. Find. Check out the new MSN Search! http://search.msn.click-url.com/go/onm00200636ave/direct/01/