I have a USB STICK inserted into my USB drive. When I go to "Create File System", I ask it to "Create A File System, it starts up. When it get's done this comes up "Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; mkfs -V -t ext4 -b 4096 -m 0 -E lazy_itable_init=0,lazy_journal_init=0 -L 'DVRStorage' '/dev/sda1' 2>&1' with exit code '1': mke2fs 1.44.5 (15-Dec-2018) /dev/sda1 is apparently in use by the system; will not make a filesystem here!". I hit close and then the other window tells me "The Operation has completed successfully". I know that is true, because there is no device listing. So what is wrong here?