its probably already taken. try a new one.
No, you cannot have the letter Ä in a username on WikiAnswers. You will get the error message: "Invalid Username: Only letters, numbers and underscores are allowed!"
It is an invalid arrangement of Roman numerals
You can't. Youtube only lets you put letters and numbers in your username.
No, you don't have too.
The username you entered contains characters that are not letters or numbers. If you entered a space or a dash (-) you'll probably get this error.
Any you wish
It comes back as an invalid code.
They have not registered and are 'guest' users.
0019
0019
2600Improved Answer:-It is invalid in Roman numerals and 2600 = MMDC
It is an invalid arrangement of Roman numerals but if you meant mmxviii it is equivalent to 2018