This version of Unity is unsupported.
Method group is Obsolete

TextureFormat.ASTC_RGB_12x12

Obsolete Enum member TextureFormat.ASTC_RGB_12x12 has been deprecated. Use ASTC_12x12 instead.
Upgrade to ASTC_12x12

Description

ASTC (12x12 pixel block in 128 bits) compressed RGB texture format.

See Also: TextureImporter.textureFormat.