Exporting Error

Hi everyone,

I have been editing videos in fcpx regularly, recently i came across with an error while trying export my edit. error msg""The operation could not be completed because an error occurred when creating frame 42196 ((Error 10008f, 00:28:07:21 <<(Error -12911c, AG3I1094.mov @ 00:00:01:33)>>)).""

Macbook pro 15inc retina display | Processor-2.5 GHz Intel Core i7 | Os EI Capitan 10.11.6 | RAM 16gb

FCPX 10 .3