Hello Mihai, look, I think that the error is the name of the time series (21/12/2012)
And the "n.s" in some files (file Nº 212 maybe). 
I send you attached the data in gretl
I hope this resolve your problem

Kind regards 

2013/9/24 cociuba mihai <cociuba@gmail.com>
I'm trying to import some real data from excel and unfortunately at the fourth sheet Gretl shows "Data error", when I'm starting Gretl from the terminal the error is "error in xlsx_set_obs_string: no markers allocated
xlsx_read_row: returning 2".
I attached the script, the excel file and the terminal output.
Any opinions?


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Cristián Arturo Ducoing Ruiz