appdata not validating

Validating appdata files is required for packaging in Fedora, and it currently fails:

+ appstream-util validate --nonet /home/hadess/Projects/packages/BUILDROOT/malcontent-0.8.0-4.fc32.x86_64/usr/share/metainfo/org.freedesktop.MalcontentControl.appdata.xml
/home/hadess/Projects/packages/BUILDROOT/malcontent-0.8.0-4.fc32.x86_64/usr/share/metainfo/org.freedesktop.MalcontentControl.appdata.xml: FAILED:
? style-invalid         : Not enough <screenshot> tags, minimum is 1
? style-invalid         : <ul> cannot start a description [(null)]
? style-invalid         : Not enough <p> tags for a good description [0/1]
Validation of files failed