TS3276 I just downloaded the OS X Lion mountain and Mail won't open.  I get an error message everytime I try to open the app.How can I fix that?

I just downloaded the OS X Lion mountain and Mail won't open.  I get an error message everytime I try to open the app.How can I fix that?

I-Photo won't open even though I have upgraded to OS X Yosemite and downloaded the I-Photo upgrader.
But have you run the the iPhoto Library upgrader? It is installed in Applications > Utilities. Launch it and direct it to your iPhoto library.
Which version of iPhoto did you upgrade from?
The upgrader is only necessary, if you have been  running iPhoto7.1.2 or earlier.

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