For Retina you should provide Icon-114.
Anyways the one you pasted should be twice in .plist file. One is standalone and second time is under:
<key>CFBundleIcons</key>
<dict>
<key>CFBundlePrimaryIcon</key>
<dict>
<key>CFBundleIconFiles</key>
<array>
<string>Icon-57px.png</string>
<string>Icon-114px.png</string>
<string>Icon-72px.png</string>
<string>Icon-144px.png</string>
<string>Default.png</string>
<string>Default@2x.png</string>
<string>Default-Landscape~ipad.png</string>
<string>Default-Landscape@2x~ipad.png</string>
</array>
<key>UIPrerenderedIcon</key>
<true/>
</dict>
</dict>
</key>
Make sure it's there as well.
You can also try right-clicking on missing files you showed and use "Select file" to update them - this will configure your plist file as well.