Please provide your Primary Password

Ever since Thunderbird went through major upgrades I keep getting pop-up messages for my Primary Password. I had no idea what that was. I never set a primary password and have never used it. Why am I getting these messages? Why can't I get rid of these pop-up messages? When I try to follow the directions to get rid of it they always ask me for my Primary Password! I DO NOT HAVE A PRIMARY PASSWORD! I NEVER HAVE HAD ONE and I HAVE BEEN USING THUNDERBIRD FOR DECADES! I am also warned that if I remove it I will lose all of my settings ad passwords. NO PASSWORDS HAVE BEEN SAVED! I have asked for help about five times and NO ONE has helped me. WILL YOU HELP ME RESOLVE THIS PERMANENTLY!? POP-UP STATES: Password require by Mozilla Thunderbird Please provide your Primary Password