ERROR – META-data ID=16 (@RANK_DOC) not string type
The error “ERROR – META-data ID=16 (@RANK_DOC) not string type” is generated in the crawler.log file when there is an error in the meta tag definitions in the mssworm.cfg. These may be generated by an improperly completed upgrade.
To resolve this, install MondoSearch on another server and take the mssworm definition for all entries with the ID X_WORM.DEFAULT.META_TAGS.LIST16 and copy them to the corrup mssworm.cfg.
Alternatively you can open a ticket in the support system and request assistance from Service.