InHouse app - "MyAppName" is no longer available

I am creating my own application using a corporate certificate. The IPA is correctly installed in the iPad and when it starts up it first asks about:

Untrusted App Developer
Do you trust the developer "XXX" to run apps on your iPad?
Trust  -  Don't trust

      

        
        
        
      

    

But after I trust the developer, I get the following message:

"MyAppName" Is No Longer Available

      

        
        
        
      

    

Last week I was able to run perfectly any custom application built with the same certificate. In other devices, built-in apps work fine, so I think this is a problem with my iPad.