Variable is not set. Defaulting to a blank string."

HI gurus
I am very very new to docker so go easy on me, I have installed docker for windows and I have created what I think to be the structure when I go to the folder where I have my dockerfile and docker-compose and run “docker-compose” to start creating and start my containers I get this error.
level=warning msg=“The "DB_PATH" variable is not set. Defaulting to a blank string.”
time=“2022-07-16T09:00:25-05:00” level=warning msg=“The "DB_USERNAME" variable is not set. Defaulting to a blank string.”
time=“2022-07-16T09:00:25-05:00” level=warning msg=“The "DB_PASSWORD" variable is not set. Defaulting to a blank string.”
time=“2022-07-16T09:00:25-05:00” level=warning msg=“The "DB_PASSWORD" variable is not set. Defaulting to a blank string.”
time=“2022-07-16T09:00:25-05:00” level=warning msg=“The "DB_DATABASE" variable is not set. Defaulting to a blank string.”
1 error(s) decoding:

  • error decoding ‘Volumes[0]’: invalid spec: :C:/folder/folder/folder/folder: empty section between colons

Any help on what am I doing wrong gurus

Thanks a bunch