the app xxx.app could not be added to your iTunes library because it is not a valid app

现在可以双击HelloiPad.ipa文件，看看可以加入到iTunes了。
直接把.app直接拖到iTunes里或者打包成.ipa，双击加入iTunes中，都会提示错误：
The app “xxx.app” could not be added toyour iTunes library because it is not a valid app
但是使用手机91助手可以安装，通过手机91助手，对于已经授权的未越狱设备，也可以尝试安装，也能安装上，
对于这种错误，官网的解释如下： https://developer.apple.com/library/ios/#qa/qa1640/_index.html
If you get the error message "The application "<applicationName>.app" could not be added to your iTunes library because it is not a valid application." (Figure 1) when installing an Ad Hoc distribution version of an iPhone
application via iTunes, it's likely that the application's

Info.plist

is missing one or more required keys.

Figure 1  'Not a valid application' error from iTunes.

These required keys are:

Bundle identifier (

CFBundleIdentifier

, default value:

com.yourcompany.${PRODUCT_NAME:identifier}

)

Bundle version (

CFBundleVersion

, default value:

1.0

)

Bundle name (

CFBundleName

, default value:

${PRODUCT_NAME}

)

These keys are part of the default

Info.plist

, and may have been accidentally deleted. Add them back to your

Info.plist

and do a clean build of your project, then try the installation again. You add keys to your

Info.plist

in Xcode by selecting any line in the

Info.plist

, clicking the plus (+) button, and selecting the appropriate item (see
Figure 2).

Figure 2  Adding the 'Bundle Version' key to Info.plist.

依照上述处理后果然可以添加到iTunes中了