I had this error come up in FME 2018. I eventually rebuilt the writer and the error went away. This was a point feature class with attachments enabled.
Hi @tinkergnome
Maybe late but... at least we have a workaround... we are using FME 2017 with many bug...
To resolve the error, just change those parameters in the writer (Z origin and Z scale)
Safe just suggest to install a new version.
Today we found a solution... without installing any other build... Installing another build is not a solution for us...