Folder limit reached — you can create at most {max} folders
Create folder refused because the account already has {max} folders (folderLimitReached).
Why this happens
Plan/setting Max folders per user (or equivalent) cap. {max} is filled from site config.
Diagnose and fix
1. Delete unused folders (after emptying them).
2. Admin: raise the max if appropriate.
3. Upgrade plan if higher tiers allow more folders.
4. See Could not create folder for non-limit failures.