analysis error while enabling remix on audition

hey there, newbie here.

I'm using audition to loop the audio file to the desired length which is easier compared to other software. so, all i do is, add a audio file and create a multitrack and start remix.

But the problem im facing here is, some of the audio files shows error "analysis error" to be exact.

So, what are the possible reasons that some of my audio files are having error while remixing.

thanks