title: eChart exception (NgxEchartsDirective -> InjectionToken NGX_ECHARTS_CONFIG)
body: <p>I am using ngx-echart in angular 7 application. I am following the example in the link:
  <a href="https://www.freakyjolly.com/angular-e-charts-using-ngx-echarts-tutorial/#.XwSANigzaUk" rel="nofollow noreferrer">https://www.freakyjolly.com/angular-e-charts-using-ngx-echarts-tutorial/#.XwSANigzaUk</a></p>
  <p>But when executing (ng serve) the application, and display the component, I am getting the below error:</p>
  <blockquote>
  <p>ERROR Error: StaticInjectorError(AppModule)[NgxEchartsDirective -&gt;
  InjectionToken NGX_ECHARTS_CONFIG]:    StaticInjectorError(Platform:
  core)[NgxEchartsDirective -&gt; InjectionToken NGX_ECHARTS_CONFIG]:
  NullInjectorError: No provider for InjectionToken NGX_ECHARTS_CONFIG!
  at NullInjector.push../node_modules/@angular/core/fesm5/core.js.NullInjector.get
  (core.js:8896)
  at resolveToken (core.js:9141)
  at tryResolveToken (core.js:9085)
  at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get
  (core.js:8982)
  at resolveToken (core.js:9141)
  at tryResolveToken (core.js:9085)
  at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get
  (core.js:8982)
  at resolveNgModuleDep (core.js:21218)
  at NgModuleRef_.push../node_modules/@angular/core/fesm5/core.js.NgModuleRef_.get
  (core.js:21907)
  at resolveNgModuleDep (core.js:21218)</p>
  </blockquote>
  <p>Any idea ?</p>
  <p>Thanks</p>