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i got this error :

/opt/Rocket.Chat/programs/server/node_modules/fibers/fibers.js:90
                                    return fn.apply(this, arguments);
                                              ^

Error: Must pass options.rootUrl or set ROOT_URL in the server environment
at Object.Meteor.absoluteUrl (packages/meteor.js:1378:11)
at runWebAppServer (packages/webapp/webapp_server.js:771:18)
at packages/webapp/webapp_server.js:1178:1
at webapp_server.js (packages/webapp/webapp_server.js:1178:16)
at fileEvaluate (packages/modules-runtime.js:336:7)
at Module.require (packages/modules-runtime.js:238:14)
at require (packages/modules-runtime.js:258:21)
at /opt/Rocket.Chat/programs/server/packages/webapp.js:1610:15
at /opt/Rocket.Chat/programs/server/packages/webapp.js:1619:3
at /opt/Rocket.Chat/programs/server/boot.js:398:38
at Array.forEach (<anonymous>)
at /opt/Rocket.Chat/programs/server/boot.js:226:21
at /opt/Rocket.Chat/programs/server/boot.js:461:7
at Function.run (/opt/Rocket.Chat/programs/server/profile.js:280:14)
at /opt/Rocket.Chat/programs/server/boot.js:460:13
EasyRSA-3.0.4.tgz: command not found
EasyRSA-3.0.4.tgz: command not found