Uninstall problem

Hey guys

I am having a very strange issue and I am not sure if its my fone or something I am doing wrong.

I am working on 2 completely separate apps. Both where working fine. Untill one of them just stopped working. I click on it and nothing happens. I click “Remove” and again, nothing happens. I try and over install the app. And it says “Unable to install”

The other project that was on hold was still working fine. Now as I can no longer test the other app on my fone I went back to my 1st project. And all was good until now. And now I am having the exact same problem.

I now have no idea what to do anymore.

Thanks for any feedback

Oh yes, and they both work perfectly on another fone. A Sony Ericsson K series phone