Java SDK - Upload file returns 404 error code

I created an application with oAuth 2.0 JWT security. I have generated the keys and applied the JSON configuration:

		// Read config file into Box Config object
		Reader reader = new FileReader("C:\\Users\\mulesoftu\\project\\src\\126855135_zrvkcx47_config.json");
		BoxConfig boxConfig = BoxConfig.readFrom(reader);
		
		// Set cache info
		int MAX_CACHE_ENTRIES = 100;
		IAccessTokenCache accessTokenCache = new 
		  InMemoryLRUAccessTokenCache(MAX_CACHE_ENTRIES);

		// Create new app enterprise connection object
		BoxDeveloperEditionAPIConnection client = 
		  BoxDeveloperEditionAPIConnection.getAppEnterpriseConnection(boxConfig, accessTokenCache);
	
		// PERFORM ACTIONS WITH CLIENT
		BoxFolder folder = new BoxFolder(client, FOLDER_ID);
		FileInputStream stream;
		
		try {
			
			stream = new FileInputStream("C:\\Users\\mulesoftu\\Desktop\\sample.json");
			BoxFile.Info newFileInfo = folder.uploadFile(stream, "sample.json");
			stream.close();
			
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

Authentication works but when I upload the file I get the following error:

com.box.sdk.BoxAPIResponseException: The API returned an error code [404 | lgvfitg2cndk661x] not_found - Not Found

I have tried to use checking "Perform Actions as Users" and reauthorize the app from Admin Console but the result is the same error.

Any idea?