ORA-04169
SIGNATURE clause of call specification string specifies a function name string that is not exported by module string.
Cause
An attempt was made to call a Multilingual Engine (MLE) call specification whose SIGNATURE clause specifies a function name that does not correspond to any exported function of the call specification's MLE module.
Action
Modify the SIGNATURE clause of the call specification or the corresponding function in the MLE module so that the SIGNATURE clause refers to a function that is exported in the MLE module.