title: Error: There can be only one type named "Upload" - Apollo, Express, Type-Graphql
body: <p>I am trying to run a simple Mutation in order to Upload an Image, but I am stack with this error:
  "Error: There can be only one type named "Upload"."</p>
  
  <p>this is my code</p>
  
  <pre><code>import { FileUploadI, GraphQLUpload } from 'graphql-upload'
  
  @Mutation(() =&gt; Picture)
    async uploadPicture(@Arg('data', () =&gt; GraphQLUpload) data: FileUploadI): Promise&lt;Picture&gt; {
      //.. implementation
    }
  </code></pre>
  
  <p>I am using Apollo and Express as Server and Typescript with Type-Graphql</p>