If you want develop and test your own application on Android without headaches do this.
First, look for the debug.keystore file. On Eclipse you can find the path from Window, Preferences, Android, Debug. Ok, copy the SHA1 fingerprint from there. From the same folder where is debug.keystore shall be the file adbkey. You can get the SHA1 fingerprint from the file adbkey.
The idea of this is to have one linked app only for develop and test the application using the files thought for debug. No need to create a new linked app for each new apk file you create.
So go to your developer console and link a new app. Use the copied SHA1 fingerprint. And you are done.
Sign your app that you are testing with debug.keystore. The password is android.
Have a happy development.