I came across this error and even though I was trying to save as one type of filetype, different from either of the two files I was joining, the two files needed to be the same type as one another, even if I was not intending the output to match either one of them. Convert one of the files to the other's filetype first and then join them.
If, perchance you have this error with two files of the same filetype, it could be that there is something wrong with the file, for example, it will play, but it will not allow you to save changes to its metatags. You just need to convert it (to the same file type, different file name) and Media Cope will fix it. I think I had this problem (I don't recall exactly) and I thought it was because of the spread of difference between their bitrates. I converted one to get closer to the other one and then joining them worked. Later, I was using MP3Tag to bath process some MP3s and for some reason some of them wouldn't allow me to change them. Those are the ones I'm figuring out right now can be fixed just by converting them using the same quality setting in Media Cope.
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