you probably have a fla with some corrupt library content.
save your fla with a unique file name.
then delete 1/2 the library contents and resave with a different file name. try publishing
if successful, the corrupt asset is in the deleted contents. if unsuccesful the corrupt asset is still in the library.
continue using trial and error deleting 1/2 contents from the incriminated library half until you narrow the candidates to one.
once your find the corrupt asset remove it from the original saved fla and retest. if successful, replace the corrupt asset and continue working on your project.