Help me Error with sqllite

Ionic Framework ionic-v3
1 
insert(table,data,callback){
    let keys = Object.keys(data);
    //INSERT INTO domain (id, api_url, company,domain,email,site_logo) VALUES (?, ?, ?, ?, ?, ?)"
    let paras = "?,".repeat(keys.length);
    paras = paras.substr(0,paras.length -1);

    let sql = "INSERT INTO " + table + "(" + keys.join() + ") VALUES (" + paras +")" ;
    return this.database.executeSql(sql,data).then(data =>{
      callback(null,data);
    },err =>{
      callback(err);
    })
  }

ERROR :slight_smile:

ERROR TypeError: Cannot read property 'executeSql' of undefined
    at DatabaseProvider.webpackJsonp.148.DatabaseProvider.insert (database.ts:78)
    at SafeSubscriber._next (domain.ts:31)
    at SafeSubscriber.__tryOrUnsub (Subscriber.js:238)
    at SafeSubscriber.next (Subscriber.js:185)
    at Subscriber._next (Subscriber.js:125)
    at Subscriber.next (Subscriber.js:89)
    at MapSubscriber._next (map.js:85)
    at MapSubscriber.Subscriber.next (Subscriber.js:89)
    at XMLHttpRequest.onLoad (http.js:1556)
    at t.invokeTask (polyfills.js:3)