contains an invalid value when using ADT in command line

I am trying to build my air project using ADT using the command line. Whenever I run the command with the .xml file and path to all related files I get the following error:

emcfiles\application.xml(47): error 302: Root content main.html is missing from package
emcfiles\application.xml(56): error 105: application.icon.image16x16 contains an invalid value
emcfiles\application.xml(57): error 105: application.icon.image32x32 contains an invalid value
emcfiles\application.xml(58): error 105: application.icon.image48x48 contains an invalid value
emcfiles\application.xml(59): error 105: application.icon.image128x128 contains an invalid value

Here is the offending part of the application.xml file:

<content>main.html</content>

<systemChrome>standard</systemChrome>
<transparent>false</transparent>
<visible>false</visible>
</initialWindow>
<installFolder>EMC Cx</installFolder>
<programMenuFolder>EMC Cx</programMenuFolder>
<icon>
<image16x16>images\icons\building.png</image16x16>
<image32x32>ext-air\resources\icons\extlogo32.png</image32x32>
<image48x48>ext-air\resources\icons\extlogo48.png</image48x48>
<image128x128>ext-air\resources\icons\extlogo128.png</image128x128>
</icon>
<fileTypes></fileTypes>
</application>

I'm not an XML expert by any means so I may be missing something really obvious but whats the invaild value? This is on a windows machine so the \ should be correct.