reactjs - Only one callback may be registered. Shows this error for Expo Appload -


here immage of error get:

here image of error. want change splash screen of app , trying use expo appload. when added on app.js shows error. how can isolve error? here code.

app.js

import react 'react'; import {stylesheet, text, view,scrollview,image,icon } 'react-native'; import {   asset,   apploading, } 'expo';   import welcomescreen './screens/welcomescreen'; import signinscreen './screens/signinscreen'; import signupscreen './screens/signupscreen'; import homescreen './screens/homescreen'; import businessscreen './screens/businessscreen'; import profilescreen './screens/profilescreen'; import settingsscreen './screens/settingsscreen'; import contactscreen './screens/contactscreen'; import forgetpassscreen './screens/forgetpassscreen'; import { tabnavigator, drawernavigator, stacknavigator,contentoptions} 'react-navigation'; import drawercontent './components/drawercontent'   export default class app extends react.component {    state = {     isready: false,   };    componentwillmount() {     this._cacheresourcesasync();   }    render() {     if (!this.state.isready) {       return <apploading />;     }      return (       <view>         <image source={require('./assets/images/expo-icon.png')} />         <image source={require('./assets/images/slack-icon.png')} />       </view>     );   }    async _cacheresourcesasync() {     const images = [       require('./assets/images/expo-icon.png'),       require('./assets/images/slack-icon.png'),     ];      (let image of images) {       await asset.frommodule(image).downloadasync();     }      this.setstate({isready: true});   } }      const mainnavigator = tabnavigator({    welcome: { screen: welcomescreen },    signin: { screen: signinscreen },    signup: { screen: signupscreen },    main: {        screen: drawernavigator({          home: { screen: homescreen },           business: { screen: businessscreen },           profile : { screen: profilescreen },          settings : {screen: settingsscreen},          contact: {screen:contactscreen},        },        {    drawerposition: 'left',             contentcomponent: props => <scrollview>< drawercontent {...props} /></scrollview>,            contentoptions: {         inactivetintcolor: '#1414fc',         activebackgroundcolor: '#383838',         activetintcolor: '#1414fc',         }        }      ),       forget  : {              screen: stacknavigator({                forgetpass:{screen: forgetpassscreen},               },            )          }      }    },     );   return (   <mainnavigator />    );   } }

how can problem solved? link of documentation of expo apploading here.

as see trying mix customized app.js includes react-navigation.


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