vitalvital
That error usually occurs when eopkg was interrupted during an install/remove process. Such as by rebooting your computer in the middle of it.
You will need to:
mkdir tmp
cd tmp
wget https://cdn.getsol.us/repo/polaris/p/piksemel/piksemel-1.3.1-5-1-x86_64.eopkg
uneopkg piksemel-1.3.1-5-1-x86_64.eopkg
sudo mkdir -p /var/lib/eopkg/package/piksemel-1.3.1-5/
sudo mv metadata.xml /var/lib/eopkg/package/piksemel-1.3.1-5/
An repeat the same sort of process for any similar error until its fixed.