your Language Lookup isn't returning an entry - [PROV_DESCR_C], rather than [PROV_DESCR_C_AN].
What does the Language_Lookup parameter map look like?
It may be that this parameter map doesn't have an entry for your $runLocale.
You could test this by providing a default entry on the parameter map such as NOENTRY.
Then if you get the error message [PROV_DESCR_CNOENTRY] you know this is the cause.