Error when uploading custom fonts

[Anne34245161l03i]

Hello, I am an administrator on an enterprise plan. When I try to upload a custom font, I get an error right at the beginning when I press the Add and manage custom fonts button. 

It goes away after a moment and then if I press the Get Started button, the page never resolves and I am unable to upload the font file.

Please advise - Thanks

[Bobby Henderson]

Does this error occur when you upload any fonts? Or is it just affecting one font file or a family of font files? What format is the custom font (TrueType, OpenType, Postscript Type 1, etc)?