When attempting to run a processing job, an error appears "processing options validation error".
Sample screenshot below:
If using a custom processing profile that was imported from a newer version of FTK, then delete the newly imported profile and recreate the custom profile, using the options in the older version.
E.g. If exporting a custom processing profile from FTK 7.3, it is best to import that only into another 7.3 version; using that custom profile in version 7.2 and earlier will cause the error.
Newer versions of FTK can have more processing options than earlier versions and those earlier versions will not understand the newer options.