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I'm trying to install the app I making on my phone. But I keep getting an error

Installation error: INSTALL_PARSE_FAILED_NO_CERTIFICATES

I'm using Eclipse. I've never seen this problem before. I have run my app on my phone hundreds of times. No apparent errors exist in any files of my project. I edited the Manifest file upping the version, but it didnt work. I cleaned my project. I uninstalled the current version of my app from my phone. But none of this works.

I have absolutely no idea what the problem is. The LogCat claims it is a problem with my main.xml file.

ERROR/PackageParser(956): Package ##MY PACKAGE NAME has no certificates at entry res/layout/main.xml; ignoring!

I havent touched this file so I dont know what could be the problem.

UPDATE: Things got more confusing. Before the problem occured I drag-n-dropped a few png files into the drawable folder (where there are already a few). After pulling my hair out it dawned on me the problem might be these files. I deleted them all (5 in total) and it works now. Only problem is I dont know why they screwed up installation.

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    Try cleaning the project and rebuilding. Commented Apr 5, 2011 at 0:49
  • Did it. Cleaned it, rebuilt it - same problem. Restarted eclipse. tried it again. Same result. I'm baffled. Commented Apr 5, 2011 at 0:52

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It seems to be a fairly common issue: http://code.google.com/p/android/issues/detail?id=830

A workaround is to export an unsigned package and sign it manually with signapk.jar

Verbatim:

Comment 26 by lucasiturbide, Apr 14, 2010 Hi everybody. I have solved this in my project by signing the APK with the debugkey and the jarsigner tool provided by android tools.

Just execute this:

 jarsigner -verbose -keystore <userhome>/.android/debug.keystore <package.apk> androiddebugkey

and you will have your nice fresh and working apk for debugging only purpose. Remember you have to sign your APK with a valid signature to publish your application at the Market

The password for the debug key with the alias "androiddebugkey" is "android".

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This solution also works when specifying your own (non-debug) keystore. Replace .../debug.keystore with the path to your own keystore, and androiddebugkey with the name of your key. Thanks!
If your ~/.android/debug.keystore does not exist, there's a command to generate the very specific one: stackoverflow.com/a/10981870/198348