Question mark box, on font book sample view

PLEASE HELP. can you tell me whats wrong here, i have no problem when im creating my first font on fontself, but today this thing happend. i made my new font i name it (victora) it works perfectly but im worried about the display view on my font book (the question mark box), and this only happend to the new font i created (victoria) the other font look fine.
thank you

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Did you assign a character to each letter before exporting the font file? If not, do so and then delete the older font from the FontBook app before installing the newer version, to avoid any font caching issue.