Files and folders cannot be named '.' or '..', nor can they contain any of the following characters:
You cannot name files and folders either '.' or '..'. For example, a file name such as ..sql is incorrect. Also, files and folders cannot contain the following characters:
Vertical bar (|).
Double quotation mark (").
Less than (<).
Greater than (>).
Question mark (?).
Forward slash (/).
Leading or trailing spaces (' '). Such spaces are stripped.
Names reserved for Windows or DOS ("nul", "aux", "con", "com1", "lpt1", and so on).
To correct this error
Reenter the file or folder name.