Object name is invalid. Object name must observe the following rules: - It must begin with an alphabetic character or an ...

Object name is invalid.
    
Object name must observe the following rules:
 - It must begin with an alphabetic character or an underscore (_).
 - It must only contain alphabetic characters, decimal digits, and underscores.
 - It must contain at least one alphabetic character or decimal digit if it begins with an underscore.