Docker error: invalid reference format: repository name must be lowercase

Question

Ran into this Docker error with one of my projects:

invalid reference format: repository name must be lowercase

What are the various causes for

Answer 1

sometimes you miss -e flag while specific multiple env vars inline

e.g. bad: docker run --name somecontainername -e ENV_VAR1=somevalue1 ENV_VAR2=somevalue2 -d -v "mypath:containerpath"

good: docker run --name somecontainername -e ENV_VAR1=somevalue1 -e ENV_VAR2=somevalue2 -d -v "mypath:containerpath"