CMMVC3511E `The password entered is not valid. Invalid character used. Type a string of 6 - 8 ASCII characters that is composed of any of the following characters: a-z, A-Z, 0-9, -, ., /, or _.`

Explanation

The password contains characters that are not valid for a password.

Type a string of 6 to 8 ASCII characters that is composed of any of the following characters: a-z, A-Z, 0-9, -, ., /, or _.
The first character cannot be a number.