in order to fix the XSI error that the OVA appliance has. You need to
1- Open the OVA file with an extractro such as 7-zip
2- extract or modify the file Datish Virtual NAS Appliance 5_2.ovf
3- find line #2 and add these text to the end of the line, right before the ">"
4- Save the file and import the OVA as usual.