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this is what i get after 9 frames (starting from filename.0001.mxs and on):

Start writing MXI file...
End writing MXI file...
[08/August/2013 11:47:46] MXI successfully renamed.
Start writing image file...
End writing image file...
[08/August/2013 11:47:46] Benchmark of 601.877. Time: 2m01s. SL of 11.81
[08/August/2013 11:47:46] Ending render process..

[08/August/2013 11:47:46] Rendering animation. Loading frame:10.

[08/August/2013 11:47:46] Reading MXS:D:/farm/tree/tree.0.mxs
ERROR: - MXS file does not exists
ERROR: - Can't load frame: D:/farm/tree/tree.0.mxs

for some reason instead of loading filename.0010.mxs maxwell stops with this message. what should i do?

Is D:/farm/tree/tree.X.mxs a referenced MXS file, or the MXS you want to render? Did you start the render from the command line with the -animation flag, or in some different way?