Regarding the error, check the result of this command:
Code:
ls -l /var/log/packages/slackpkg+*
If it returns more than one file or the filename contains "upgraded", it probably means that you made several attempts at launching the mledoffline.sh script and the previous attempts "botched" the installation.
It happened to me (when installing other packages) while using mledoffline.sh and I attributed it a connection problem of the USB key because after removing the "upgraded" packages, the script reran without error.
Should you have a "slackpkg+*upgraded" file return from previous command, you should removed the package using:
Code:
removepkg /var/log/package/slackpkg+*upgraded*