I know a lot of people have run into this problem before but i've
searched everywhere and i cant seem to find an answer. I wrote an
extension and i tried to package it up into a xpi and install it.
However, i get this error "install script not found". How do i debug this?

Here is my install.rdf file:

<?xml version="1.0"?>

<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:em="http://www.mozilla.org/2004/em-rdf#">

<Description about="urn:mozilla:install-manifest">

<em:name>RH_Lookup</em:name>
<em:id>{1c1bc1d0-930d-11da-a72b-0800200c9a66}</em:id>
<em:version>0.5</em:version>
<em:description>Tool for looking up information on RH.com</em:description>
<em:creator>Manish S</em:creator>
<em:homepageURL>http://www.rh.com/</em:homepageURL>

<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>1.5</em:minVersion>
<em:maxVersion>1.5.0.*</em:maxVersion>
</Description>
</em:targetApplication>

</Description>
</RDF>

Here is my directory structure:

rh
/chrome.manifest
/install.rdf
/chrome -->content: rh.js, overlay.xul, rh.css

I was testing this locally, by just adding a file with the path to the
extension in the extensions directory for firefox and it worked fine.
But with the xpi, it says "install script not found".

I'm using a mac with the dropZip application to create a zip file. I
then rename the file to .xpi from the terminal.

I would greatly appreciate any help.

Thanks in advance.