ChowMatrix: [BUG] Failed to load LV2 plugin.

Describe the bug LV2 plugin can’t be loaded by both Ardour6 and carla. Here is the error message:

lilv_plugin_get_name(): warning: Plugin <file:///home/billson/.lv2/ChowMatrix.lv2/manifest.ttl> has no (mandatory) doap:name

To Reproduce I follow your instruction written in README.md to compile the latest version.

Screenshots

Maybe the URI is not correct. When I try to load the plugin, this window pops up.

Desktop (please complete the following information):

• OS: [Arch Linux]
• DAW [Ardour 6.5.0, carla 2.2.0]

The generated LV2 bundle manifest.ttl

@prefix lv2:  <http://lv2plug.in/ns/lv2core#> .
@prefix pset: <http://lv2plug.in/ns/ext/presets#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix ui:   <http://lv2plug.in/ns/extensions/ui#> .

<>
    a lv2:Plugin ;
    lv2:binary <ChowMatrix.so> ;
    rdfs:seeAlso <ChowMatrix.ttl> .

<#ExternalUI>
    a <http://kxstudio.sf.net/ns/lv2ext/external-ui#Widget> ;
    ui:binary <ChowMatrix.so> ;
    lv2:requiredFeature <http://lv2plug.in/ns/ext/instance-access> ;
    lv2:optionalFeature ui:touch ;
    lv2:extensionData <http://kxstudio.sf.net/ns/lv2ext/programs#UIInterface> .

ChowMatrix.ttl

@prefix atom: <http://lv2plug.in/ns/ext/atom#> .
@prefix doap: <http://usefulinc.com/ns/doap#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix lv2:  <http://lv2plug.in/ns/lv2core#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix ui:   <http://lv2plug.in/ns/extensions/ui#> .

<>
    a lv2:Plugin ;
    lv2:requiredFeature <http://lv2plug.in/ns/ext/buf-size#boundedBlockLength> ,
                        <http://lv2plug.in/ns/ext/urid#map> ;
    lv2:extensionData <http://lv2plug.in/ns/ext/options#interface> ,
                      <http://lv2plug.in/ns/ext/state#interface> ,
                      <http://kxstudio.sf.net/ns/lv2ext/programs#Interface> ;

    lv2:microVersion 0 ;
    lv2:minorVersion 3 ;

The angle bracket before a lv2:Plugin ; is empty, is that normal?