'NoneType' object has no attribute 'location'

[michalski9wsb]

Hi, i have a problem with step 7. I can't create an app with this command:
az webapp create --resource-group myResourceGroup --plan myAppServicePlan --name <app_name> --runtime "PHP|7.0" --deployment-local-git

because of it:

usage: az webapp create [-h] [--verbose] [--debug]
                       [--output {json,jsonc,table,tsv,yaml,none}]
                       [--query JMESPATH] [--subscription _SUBSCRIPTION]
                        --resource-group RESOURCE_GROUP_NAME --name NAME
                        --plan PLAN [--runtime RUNTIME]
                        [--startup-file STARTUP_FILE]
                        [--deployment-container-image-name DEPLOYMENT_CONTAINER_IMAGE_NAME]
                        [--deployment-source-url DEPLOYMENT_SOURCE_URL]
                        [--deployment-source-branch DEPLOYMENT_SOURCE_BRANCH]
                        [--deployment-local-git]
                        [--docker-registry-server-password DOCKER_REGISTRY_SERVER_PASSWORD]
                        [--docker-registry-server-user DOCKER_REGISTRY_SERVER_USER]
                        [--multicontainer-config-type {COMPOSE,KUBE}]
                        [--multicontainer-config-file MULTICONTAINER_CONFIG_FILE]
                        [--tags [TAGS [TAGS ...]]]
az webapp create: error: 'NoneType' object has no attribute 'location

Hava an idea?

Edit:
I used bad name of Resource Group before in command az appservice plan create