human
Solve the following python programming problem given the following code:
def ValidateToken(token, targets) : 
    "Does basic token validation.

  Args:
    token: User's credentials as access_control.ACLToken.
    targets: List of targets that were meant to be accessed by the token.
             This is used for logging purposes only.
  Returns:
    True if token is valid.

  Raises:
    access_control.UnauthorizedAccess: if token is not valid.
    ValueError: if targets list is empty.
  " 
    def GetSubjectForError() : 
        if (len (targets) == 1) : 
            return list (targets) [0] 
else : 
            return None 
if (not token) : 
        raise access_control.UnauthorizedAccess (('Must give an authorization token for %s' % targets), subject = GetSubjectForError ()) 
token.CheckExpiry () 
    if (not token.username) : 
        raise access_control.UnauthorizedAccess (('Must specify a username for access to %s.' % GetSubjectForError), subject = GetSubjectForError ()) 
return True 

    
    

    Fix the buggy line: raise access_control.UnauthorizedAccess (('Must specify a username for access to %s.' % GetSubjectForError), subject = GetSubjectForError ())
assistant
#Here is Python code to fix the buggy line: raise access_control.

raise access_control.UnauthorizedAccess (('Must specify a username for access to %s.' % targets), subject = GetSubjectForError ())