SafeArray element type None is not supported.,Additional information: SafeArray element type None is not supported.

I’m going to export unity android project to android studio.
At “Player Settings”
I switched Scripting Backend to “IL2CPP”.

But while building project for android studio…
It says like this.
Additional information: SafeArray element type None is not supported.

Please help me to fix this error.

Is there anybody who knows SafeArray??