eXtplorer - PHP-based File Manager

I have installed succesfully on joomla 1.7.0 extplorer RC5.
The problem is that i can't upload archives. On Iexplorer 8 apears a window (Website Dialog) with nothing on it.
The error in explorer is:

Agente de usuario: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; chromeframe/21.0.1171.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; InfoPath.1; Media Center PC 5.0; SLCC1)
Fecha: Mon, 18 Jun 2012 08:37:30 UTC

Mensaje: Se esperaba un objeto
Línea: 51
Carácter: 132732
Código: 0
URI: http://www.consolacio.es/web2/administrator/components/com_extplorer/fetchscript.php?&subdir[]=scripts/editarea/&file[]=edit_area_full_with_plugins.js&subdir[]=scripts/extjs3/adapter/ext/&file[]=ext-base.js&subdir[]=scripts/extjs3/&file[]=ext-all.js&subdir[]=scripts/extjs3-ext/ux.ondemandload/&file[]=scriptloader.js&subdir[]=scripts/extjs3-ext/ux.editareaadapater/&file[]=ext-editarea-adapter.js&subdir[]=scripts/extjs3-ext/ux.statusbar/&file[]=ext-statusbar.js&subdir[]=scripts/extjs3-ext/ux.fileuploadfield/&file[]=ext-fileUploadField.js&subdir[]=scripts/extjs3-ext/ux.locationbar/&file[]=Ext.ux.LocationBar.js&gzip=1

what can i do?

thanks