./dashboard.sh terminates with exit code 1

When the following command is executed 

```bash
./dashboard.sh
```

I get the error 

> Error: unknown shorthand flag: 'e' in -execute
> See 'influx -h' for help
> command terminated with exit code 1

which is thrown from the line 

```bash
kubectl exec -ti -n $tenant $influxdb_pod -- influx -execute 'CREATE DATABASE jmeter'
```

How do I solve this?
