Processing Failed

Today I uploaded a few After Effects template. The file structure is like this;

- Footage
- Fonts
- blabla.aep
- Help Documentation for blabla.docx
- metadata.txt
- preview.mp4
- thumbnail.jpg

When I upload by dragging & dropping it says:
Processing Failed
Error during processing. Please try again or contact us if you continue to experience issues.

Am I doing something wrong or is the system down?

Please help.

Oops, I got it.
If you are experiencing this kind of situation, so be aware of the "Fonts" folder.
I added "Fonts" folder to my .zip file, that's why processing fails.

Do not add "Fonts" folder into your .zip file.