Appstream validate fails

[App Center]

AppCenter tried to run appstreamcli validate on com.github.muriloventuroso.pdftricks and
received the following errors:

E - com.github.muriloventuroso.pdftricks.appdata.xml:com.github.muriloventuroso.pdftricks
    The component is missing a long description. Components of this type must have a 
    long description.

Validation failed: errors: 1

For more information, see:

• The AppStream Quickstart Guide
• The AppStream Metadata Specification

Build Information

Affects Architecture: amd64
Affects Distribution: juno
Built with the following references:

• refs/tags/0.1.1