Sorry only letters (a-z) numbers (0-9) and periods (.) are allowed ||Problem Gmail account

Hi guys in this video i will tell you about problem that is coming when you create gmail accounts that problem is coming " sorry only letters (a-z) numbers (0-9) and periods (.) are allowed how can you solve, first select recommended Gmail address if you create your own Gmail account address then you can can&use symbols ampersand & equals sign = underscore _ apostrophe - dash + plus sign brackets and more than one period . in a row like ... .