Runtime error while running

[sourabhtk37]

Hello,

I am facing issues while trying to run the exporter, I am wondering If I have missed some necessary pre-requisites or configuration changes:

$ ./azure_metrics_exporter --config.file="azure.yml"
2021/01/12 04:53:14 Using managed identity
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x40 pc=0x827dd5]

goroutine 1 [running]:
main.(*AzureClient).getAccessToken(0xc0000662c0, 0x0, 0x0)
	/home/tsourab/go/src/github.com/RobustPerception/azure_metrics_exporter/azure.go:224 +0x355
main.main()
	/home/tsourab/go/src/github.com/RobustPerception/azure_metrics_exporter/main.go:321 +0xdf

azure.yml

---
active_directory_authority_url: "https://login.microsoftonline.com/"
resource_manager_url: "https://management.azure.com/"
credentials:
  subscription_id: "<subscription ID here>" 

resource_groups:
  - resource_group: "tsourab-metric"
    resource_types:
      - "Microsoft.Compute/virtualMachines"
    resource_name_include_re:
      - "metrics"
    metrics:
      - name: "CPU Credits Consumed"

OS: Fedora 33
Kernel: 5.8.15-301.fc33.x86_64
Go version: go version go1.15.6 linux/amd64

[brian-brazil]

That doesn't look possible, NewAzureClient can never return nil.