here is the crash logs
Anonymous UUID: 597B5634-D743-A5ED-10C9-32D1331DC2F1
Mon Dec 30 20:49:47 2013
panic(cpu 7 caller 0xffffff800ec36a26): "thread_invoke: preemption_level 1, possible cause: blocking while holding a spinlock, or within interrupt context"@/SourceCache/xnu/xnu-2422.1.72/osfmk/kern/sched_prim.c:2231
Backtrace (CPU 7), Frame : Return Address
0xffffff80ffa7ba20 : 0xffffff800ec22f69
0xffffff80ffa7baa0 : 0xffffff800ec36a26
0xffffff80ffa7bb30 : 0xffffff800ec35d4c
0xffffff80ffa7bb70 : 0xffffff800ecd5a00
0xffffff80ffa7bbc0 : 0xffffff800ecd0d9d
0xffffff80ffa7b