deno sqlite error logs Deno.openSync is not function

**my half code :**
```
import { Application,Router } from "https://deno.land/x/oak/mod.ts";
import { DB } from "https://deno.land/x/sqlite/mod.ts";
import { oakCors } from "https://deno.land/x/cors/mod.ts";
const db = new DB("./datamain.sqlite"); > **error in here in my line logs**

```

**my logs**

###
TypeError: Deno.openSync is not a function at js_open (https://deno.land/x/sqlite@v3.1.3/build/vfs.js:27:24) at denoOpen (wasm://wasm/0028f022:1:2960) at sqlite3BtreeOpen (wasm://wasm/0028f022:1:148034) at openDatabase (wasm://wasm/0028f022:1:144000) at sqlite3_open_v2 (wasm://wasm/0028f022:1:149501) at open (wasm://wasm/0028f022:1:3771) at https://deno.land/x/sqlite@v3.1.3/src/db.ts:45:67 at setStr (https://deno.land/x/sqlite@v3.1.3/src/wasm.ts:13:24) at new DB (https://deno.land/x/sqlite@v3.1.3/src/db.ts:45:24) at **file:///src/main.ts:4:12**
--