firefox extension reports error add-on corrupts - firefox

Question

I try to follow the instruction at
https://developer.mozilla.org/en/docs/Building_an_Extension
to build a firefox add-on.
I changed install.rdf to
<?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:id>helloworld#mozilla.doslash.org</em:id>
<em:name>Hello World extension for Firefox</em:name>
<em:version>1.0</em:version>
<em:description>Demo extension.</em:description>
<em:creator>Nickolay Ponomarev</em:creator>
<!-- optional items -->
<em:contributor>A person who helped you</em:contributor>
<em:contributor>Another one</em:contributor>
<em:homepageURL>http://kb.mozillazine.org/Getting_started_with_extension_development</em:homepageURL>
<!--em:optionsURL>chrome://sampleext/content/settings.xul</em:optionsURL>
<em:aboutURL>chrome://sampleext/content/about.xul</em:aboutURL>
<em:iconURL>chrome://sampleext/skin/mainicon.png</em:iconURL>
<!-- Firefox -->
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>12.0</em:minVersion>
<em:maxVersion>32.＊</em:maxVersion>
</Description>
</em:targetApplication>
</Description>
</RDF>
when install it reports
your comment welcome

Answer 1

The core files of an extension (install.rdf, chrome.manifest and bootstrap.js where applicable) must be saved with ANSI encoding. Check if your editor defaults to some unicode flavor.