Unity3d export as Android program invokation failed

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When you use the latest unity3d version and the latest Android SDK to export the android program, the following error occurs.
Error building PLAYER: exception: Android (invokation failed) error: Unknown error

According to the official explanation, unity3d has a problem with the support for the latest Android SDK (R22.

We should use the official Android SDK of R21 for export.

In addition, the new version requires the android 4.0 SDK for export. Download the SDK manager directly.

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Because the current project is working on unity3d, although I have learned it for a short time before, it is easy to get started and proficient. Now, when we have time, we will translate a series of unity3d tutorials and share them with you while learning.