Problems with installing pgwatch2 without docker

Hi,
I'm trying to install the pgwatch2 tool in our company without using the docker option. I followed the instructions that are specified in the github page but I'm facing an error during STEP 4.2 when I try to add my cluster to be the /dbs page in order to monitor it. After I add it I'm getting the error :
ERROR: Could not connect to InfluxDB

On the same machine I have an influxdb database running :
ps -ef | grep influx
influxdb 3680 1 0 17:12 ? 00:00:01 influxd -config /PostgreSQL/influxdb/config/influxdb.conf

When I look at the log of the influxdb I see that every time I press the "New" button under DBS page the next row :
[httpd] ::1 - root [08/Jul/2018:17:19:04 +0300] "GET /query?q=SHOW+TAG+VALUES+WITH+KEY+%3D+%22dbname%22&db=pgwatch2 HTTP/1.1" 401 33 "-" "python-requests/2.19.1" de27bc5c-82b9-11e8-8003-000000000000 141

What else do you recommend to check ?

Thanks , Mariel.