Errors in document flow from database to file

Lamis Alaa

i get these error in my document flow to send custom bod from database to file :

M3Database

Database action document of connection point ‘m3_db’ has no value.

M3Database

Incoming document ‘null’ is not known in the Data Catalog.

M3Database

Outgoing document ‘null’ is not known in the Data Catalog.

M3Database

Mandatory property ‘Read noun’ of connection point ‘m3_db’ has no value.

M3Database

Mandatory property ‘Read verb’ of connection point ‘m3_db’ has no value.