Problem reinstalling an app


I had installed the poll app once for testing purpose, and I deinstalled again
Now I want to reinstall it on my rocket chat server and I get the error message:
“Can not update an App that does not currently exist.”
The message is shown on the App Install Page.

The logs show nothing about this error

Did anyone else run into this Problem.

Thanks for your help in advance.

Server Setup Information

Version of Rocket.Chat Server: 3.0.4
Operating System: centos 8.1
Deployment Method: standalone
Number of Running Instances: 1
DB Replicaset Oplog:
NodeJS Version: v12.14.0
MongoDB Version: 4.0.17
Proxy: Apache/2.4.37
Firewalls involved: centos firewall

problem is solved. it seems you have to use the install button, shown directly after you searched for the app in the marketplace. I always clicked on the found app and used the install button shown on the popup window