Force Calibre to Stop Job

I just got a TCL 60 Xe Nxtpaper phone, and I wanted to put some books on it to try the ereader mode that it has. I plugged it in, opened Calibre, and it asked me if I wanted Calibre to manage it (or something like that). I said yes, and it showed up as a device. I tried sending a book over, but it wouldn't finish the job because under "Get list of books on device", the "Object Found" was a file in my download folder. I deleted all of the files in that folder, and it added the book. I was than able to manage the device and pick the specific folder that I wanted to use on my phone. I tried adding another book, and it's failing again, because now it's picking Alice In Wonderland, which gets added when you install Moon+ Reader Pro.

All I want to know is, how do I force Calibre from trying to complete the job, so when I plug my phone in again, Calibre doesn't automatically lock up? I want to cancel this job completely. I thought plugging in a different ereader would satisfy Calibre. At first I thought it did, because the job ran and appeared to complete, but as soon as I plugged my phone in, it went back to not being able to complete the job.

Thanks

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