This plugin failed to start

[pierre-yves56]

Hello,
I installed the collabora-mattermost plugin from the command line with git clone
I get the following error message in the console: This plugin failed to start. Please check your logs for errors.
! [image] (https://user-images.githubusercontent.com/73749600/117789621-ceb09300-b248-11eb-99b3-570626125f25.png)

Here is a copy of plugin.json:
! [image] (https://user-images.githubusercontent.com/73749600/117789727-ea1b9e00-b248-11eb-8808-b819a7f722aa.png)

As well as an error message in the Mattermost logs:

May 09 19:47:03 mattermost [28406]: {“level”: “error”, “ts”: 1620582423.6453817, “caller”: “mlog / log.go: 232”, “msg”: “Unable to activate plugin ”,“ plugin_id ”:“ com.collaboraonline.mattermost ”,“ error ”:“ unable to generate webapp bundle: com.collaboraonline.mattermost: unable to copy webapp bundle directory: com.collaboraonline.mattermost: stat plugins / com. collaboraonline.mattermost / webapp / dist: no such file or directory ”,“ errorVerbose ”:“ stat plugins / com.collaboraonline.mattermost / webapp / dist: no such file or directory \ nunable to copy webapp bundle directory: com.collaboraonline. mattermost \ ngithub.com/mattermost/mattermost-server/v5/plugin. (* Environment) .UnpackWebappBundle \ n \ tgithub.com/mattermost/mattermost-server/v5/plugin/environment.go: 406 \ ngithub.com/mattermost /mattermost-server/v5/plugin.(Environment).Activate\n\tgithub.com/mattermost/mattermost-server/v5/plugin/environment.go:256\ngithub.com/mattermost/mattermost-server/v5/ app. ( App) .SyncPluginsActiveState.func2 \ n \ tgithub.com/mattermost/m attermost-server / v5 / app / plugin.go: 132 \ nruntime.goexit \ n \ truntime / asm_amd64.s: 1374 \ nunable to generate webapp bundle: com.collaboraonline.mattermost \ ngithub.com/mattermost/mattermost-server/ v5 / plugin. (* Environment) .Activate \ n \ tgithub.com/mattermost/mattermost-server/v5/plugin/environment.go: 258 \ ngithub.com/mattermost/mattermost-server/v5/app. (* App ) .SyncPluginsActiveState.func2 \ n \ tgithub.com/mattermost/mattermost-server/v5/app/plugin.go: 132 \ nruntime.goexit \ n \ truntime / asm_amd64.s: 1374 ”}

I'm not sure how to go about it. Someone would have any idea ?
Thank you in advance for your help.
P-Y