datalog functions to get measures from my process

I am using the datalog functions to get measures from my process. I store these measures in a Data Block, and I want to create a datalog to export this block. When I visualize the program, the instruction "DatalogCreate" is activated (in green), and REQ get a positive edge (I push a button). The picture in attachment shows the state of the program just after the positive edge. At this moment, the status of the DatalogCreate DB is "7000", which is, I suppose, normal. The point is that the instruction is NOT VALIDATED. "DONE" did not pass from 0 to 1. If it did, the memory I set with "DONE" would be active.

I am sure that the problem is not so complicated, but I am not an expert in STEP7 programmation. Can you help me, please?

The interface is in French, but it shouldn't cause any mistake.

In reference to my previous messages, somebody suggested me that I change the compatibility option of the block in which I stored my data: not optimized, but compatible for S300/400. I did, but this is obviousely not a good solution. The datalog has been though created, once and for all, but since I switched off the power supply, I have never managed to create another one. The status of the instruction is still 8C51, and the datalog is not created. I would like to eventually know why the type of data is not validated in the DATA parameter. I am sorry for the French interface, I know that it is disturbing.

Please can you help me, because, in front of my computer, I am like this:

Hello to all

I write program for data loging, everything is fine but have a little problem:If I don`t clear a log file from web server and power off on PLC new data log can not overwrite on old file

I found the solution to the problem I posted here up. It is a question of DB name. The variable references in the instruction "DatalogCreate" to the DB in which I stored my data to be transferred don't refresh correctly. So, those references (like the DATA parameter) were outdated.