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but still it gives error incorrect cell type error

I am passing xmlstream with cell type as dhxCalendar with empty string as follows
 <rows&gt;
  <row&gt;
<cell type='dhxCalendar' /&gt;  
</row&gt;
</rows&gt;

i ahs added excell files as per you suggested.
but still it gives error incorrect cell type error
so what's wrong with my code.

Please check attached sample, it uses the same init, but works correctly. 
The only possible reason of problem missed dhtmlxgrid_excell_dhxCalendar.js file

By the way, row tag must have ID attribute