Cause: the primary key value parameter
passed to the service request is null
Action: check primary key
parameter

Relared Errors:
DRG-11410:
could not insert into string result table
DRG-11418:
insufficient document content for linguistic parser
DRG-11422:
linguistic initialization failed
DRG-11425: gist
level string is invalid
DRG-11427:
valid gist level values are string
DRG-11432: file
error while accessing knowledge base
DRG-11435:
primary key value is invalid
DRG-11439:
index name length exceeds maximum of string bytes
DRG-11440:
operation not supported for the string language
DRG-11441: gist
numParagraphs string is invalid