Hi Ruangsak,
The problem occured due to the RFC connection. RFC connection is not configured properly.
Also use the ABAP Data flow, since you are trying to retrieve the data from the ECC system.
Normal data flow may not be supported.
Once the RFC is established in the Management console, re create the new data store which points to the R3 system and hence forth try the extraction process to trigger the table from the ECC system.
Best,
Sanjay