That’s all pretty much meaningless to anyone but an Apple engineer but from the looks of it it’s just saying FCPX ran out of resources while importing files. Which could be anything from RAM issues, to hard drive issues, to just one of those things….
Which is all not much help at all… So it’d probably be better to know the specifications of the computer and the hard drive, the types of files you were trying to import, etc… and have you tried the usual fixes like resetting preferences or reinstalling FCPX?