Simple XML: Setting a cell value in PHP

[Frozt]

I have a .xml document created with excel for mac. I able to set the value of a cell in php using:\[code\]$myxml = simplexml_load_file('test.xml');$mylocations->Worksheet->Table->Row[0]->Cell[0]->Data = 'http://stackoverflow.com/questions/12715647/test';$mylocations->asXml('updated.xml');\[/code\]This creates the updated.xml file successfully and If i view it in browser the xml shows the correct value. However if i try and open the .xml in excel for mac, it throws an error:'Problems came up with the following areas during load: Worksheet setting, table.'What am I doing wrong here?