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It means that the program you are tying to log onto does not recognise the User Name you have entered. Enter the correct User name.
Invalid credentials means that one does not have the right to access something. You most likely do not have the correct user name and/or password.
User name.
user name
User name
user name is screen name
A good user name should be at least 8 characters long. Anything less that that could be easily compromised.
A password is a private combination of characters associated with a user name and allows access to certain computer resources.
it means that he/she is a facebook user ??
A username identifies the specific user who is operating the software.
Most phrases can be understood by thinking about what each word means. Invalid means false, inaccurate. Birthday is the date of a person's birth. The phrase "invalid birthday" would most likely be seen on the Internet, on websites that ask a User to enter a birth date. Web designers often use the least words to make their statement. So "invalid birthday" is a quick way to alert a Website User to "check what you entered in the form, it seems wrong". Most often, a User forgot to change the year. As an example, no one can be born NOW or as yet on May 1, 2013.
true