I solve this problem by changing line of code in woocommerce\includes\wc-user-functions.php =>Line 47.
after if ( email_exists( $email ) ) {
write return ;
and remove :”return new WP_Error( ‘registration-error-email-exists’, apply_filters( ‘woocommerce_registration_error_email_exists’, __( ‘An account is already registered with your email address. Please log in.‘, ‘woocommerce’ ), $email ) );”
it should be like this :
if ( email_exists( $email ) ) {
return ;
}
but you should to remember every time you update woocommerce plugin to go and change the code to still work