Upgrade to package: mattermost to 5.19.1 and still getting a problem:
{"level":"error","ts":1584695137.1472464,"caller":"mlog/log.go:174","msg":"Unable to activate plugin","plugin_id":"mattermost-autolink","error":"unable to start plugin: mattermost-autolink: fork/exec /usr/local/www/mattermost/plugins/mat
termost-autolink: permission denied","errorVerbose":"fork/exec /usr/local/www/mattermost/plugins/mattermost-autolink: permission denied\nunable to start plugin: mattermost-autolink\ngithub.com/mattermost/mattermost-server/v5/plugin.(*Env
ironment).Activate\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/plugin/environment.go:251\ngithub.com/mattermost/mattermost-server/v5/app.(*App).SyncPluginsActiveState\n\t/wrkdirs/usr/ports/www/mattermost-ser
ver/work/mattermost-server-5.19.1/app/plugin.go:106\ngithub.com/mattermost/mattermost-server/v5/app.(*App).InitPlugins.func2\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/app/plugin.go:197\ngithub.com/mattermo
st/mattermost-server/v5/config.(*emitter).invokeConfigListeners.func1\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/config/emitter.go:35\nsync.(*Map).Range\n\t/usr/local/go/src/sync/map.go:333\ngithub.com/matt
ermost/mattermost-server/v5/config.(*emitter).invokeConfigListeners\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/config/emitter.go:33\ngithub.com/mattermost/mattermost-server/v5/config.(*commonStore).set\n\t/
wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/config/common.go:90\ngithub.com/mattermost/mattermost-server/v5/config.(*FileStore).Set\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/confi
g/file.go:107\ngithub.com/mattermost/mattermost-server/v5/app.(*App).SaveConfig\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/app/config.go:382\ngithub.com/mattermost/mattermost-server/v5/app.(*App).EnablePlug
in\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/app/plugin.go:346\ngithub.com/mattermost/mattermost-server/v5/api4.enablePlugin\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/api4/p
lugin.go:305\ngithub.com/mattermost/mattermost-server/v5/web.Handler.ServeHTTP\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/web/handlers.go:163\ngithub.com/NYTimes/gziphandler.GzipHandlerWithOpts.func1.1\n\t/
wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/vendor/github.com/NYTimes/gziphandler/gzip.go:336\nnet/http.HandlerFunc.ServeHTTP\n\t/usr/local/go/src/net/http/server.go:2007\ngithub.com/gorilla/mux.(*Router).ServeH
TTP\n\t/wrkdirs/usr/ports/www/mattermost-server/work/mattermost-server-5.19.1/vendor/github.com/gorilla/mux/mux.go:212\nnet/http.serverHandler.ServeHTTP\n\t/usr/local/go/src/net/http/server.go:2802\nnet/http.(*conn).serve\n\t/usr/local/g
o/src/net/http/server.go:1890\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1357"}