Concatenating two dataset

Hi Francois,
I am following your instruction to concatenate two raw files imported in database. When I run, it gave me this error message:

 line 279: Dot indexing is not supported for variables of this type.
------------------------------------
Call stack:
>bst_process.m>Run at 279
>bst_process.m at 37
>panel_process1.m>RunProcess at 124
>panel_process1.m at 26
.........

When I run code generated by scripting, this is the error code:

Dot indexing is not supported for variables of this type.

Error in bst_process>Run (line 279)
        allStudies = bst_get('Study', unique([sInputs.iStudy]));

Error in bst_process>CallProcess (line 2290)
        OutputFiles = Run(sProcess, sInputs, sInputs2, 0);

Error in bst_process (line 37)
eval(macro_method);

Error in script_concatenateTime (line 12)
sFiles = bst_process('CallProcess', 'process_concat', sFiles, []);

Please help.
Yuyuan