while uploading file to android market error

When i am uploading my application in android market it showing below error

The 开发者_开发百科file is invalid:ERROR:dump failed because no AndroidManifest.xml found.

When I unzip the .apk file, the AndoridManifest.xml file is there.

What's the problem?

following points are need to be taken care of while uploading file on android market

1. "android:versionCode" attribute from AndroidManifest.xml is proper.
2. "android:versionName" attribute from AndroidManifest.xml is proper.
3. The package name is very unique,. Because all the apps on android market are separated by the package.

see all this is in place....