The environment file is invalid: Dotenv values containing spaces must be surrounded by quotes

Hello everyone I need help regarding this error message: “The environment file is invalid: Dotenv values containing spaces must be surrounded by quotes”

I just finished setting up environment for my app according to the request of the wizard installer of the app. I input things like database credentials, mail credentials, google client ID and others. After that, upon visiting my website, I found this error. That made me to remember that when I was filling the forms, I spaced out my username when entering the mail credentials, so I don’t know if that is part of my problem now.

So, how do I access the Dotenv file according to the error instruction to check the files with spaces and correct them? OR Which command will I use to get rid of this once and for all?

In fact, how do I solve this problem?

Thanks, everyone. looking forward to hearing from you.