DataviewJS Snippet Showcase

when I run the snippets, I got an error like:

Evaluation Error: TypeError: Cannot read properties of undefined (reading ‘toString’)
at eval (eval at (plugin:dataview), :122:67)
at DataviewInlineApi.eval (plugin:dataview:18370:16)
at evalInContext (plugin:dataview:18371:7)
at asyncEvalInContext (plugin:dataview:18381:32)
at DataviewJSRenderer.render (plugin:dataview:18402:19)
at DataviewJSRenderer.onload (plugin:dataview:17986:14)
at e.load (app://obsidian.md/app.js:1:869278)
at DataviewApi.executeJs (plugin:dataview:18921:18)
at DataviewPlugin.dataviewjs (plugin:dataview:19423:18)
at eval (plugin:dataview:19344:124)

how to fix it?