Scripting:how can I import the asset folder by script?

var audiofile = studio.project.workspace.masterAssetFolder.getAsset(“sfx_char_skill01_blast_r01.wav”)
audiofile.setAssetPath(“sfx/sfx_char_skill01_blast_r01.wav”)

I used the codes to set audiofile folder, but the folder shows #unimported, how can I import the folder by script?
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