ID:14867 Found illegal characters in the output file name. File names must start with a letter, cannot end with an underscore (_), and cannot contain two underscores (_ _) in a row. No slash (/) or dash (-) is permitted.

CAUSE: The Quartus Prime software found illegal characters in the output file name. File names must start with a letter, cannot end with an underscore (_), and cannot contain two underscores (_ _) in a row. No slash (/) or dash (-) is permitted.

ACTION: Click OK to close the message dialog box, and then specify an output file name that starts with a letter and contains legal characters.