While FZLTZHK--GBK1-0 is built directly into Mac operating systems for personal presentation and system display use, . If you intend to use this font face in public advertisements, broadcast television, print media, or embedded application code for commercial profit, you must acquire a digital publishing agreement directly through Founder Type or an authorized font clearinghouse. Using system fonts for external corporate monetization without proper authorization can result in legal copyright claims.

The fastest way to fix the error without hunting down a file is font mapping. Because this is heavily associated with Chinese GBK encoding, you can safely substitute it with standard Chinese system fonts that you likely already have installed: SimHei, Microsoft YaHei, or SimSun. macOS: PingFang SC, Heiti SC, or STHeiti. Solution 2: Install Founder Type Fonts

If you are the one sending the file to someone else and they are getting this error, you can prevent it entirely before exporting:

The seemingly random string of characters in "FZLTZHK--GBK1-0" is an alphanumeric code used by operating systems and design software to identify the font's specific family, weight, and character encoding standard:

Unlike traditional Songti (which has serifs), the Zhuan Hei style is clean, geometric, and minimalist.