HT204406 Why do I keep getting an error message (4002) when my match tries to match?

Question

I just want to make sure it isn't something I'm doing wrong.

Answer 1

FIRST: COPY your itunes Library.itl and .xml files into a separate folder—just in case.
I don't know why you get the error, as I did. I do know I found another response (wish I could find it to give credit) that suggested turning Match off (Store > Turn off iTunes Match>), turn it back on again, and it should "reboot" Match, so to speak.I
The first time I tried this, I got a little worried when I saw that iTunes expected me to assign this computer to iMatch—it didn't recognize it. But I had no choice. When it opened, I found NONE of my Match data for my library of over 22,000 tracks.
I started over, and it was taking well over an hour to renew the process. I decided to drop it. I quit iTunes and restarted with the Option key to choose my backed-up earlier library (which had been getting 4002).
Today I decided to try again. I turned off Match, turned it back on, got worried again when I still had to assign the Mac to Match. I let it go through the process, and as I type this it's uploaded 71 of the final 85 items added since I began getting the error.
So I emphasize: BACK UP YOUR ITUNES LIBRARY FILES, just in case. My first time trying this may have been perfectly normal—as it seems to be today—but having that backup offers security.
Good luck! HTH.