Ngc error: Compilation failed. Genymotion, ionic2, rc0

Ionic Framework ionic-v3
9

Hi,

I’m getting a similar error:

[21:56:25]  ngc: Error: Error at D:/Users/User/Desktop/project/.tmp/app/app.module.ngfactory.ts:587:140: Property 'string' does not exist on type 'typeof "D:/Users/User/Desktop/project/.tmp/providers/firebase.service"'.
  at check (D:\Users\User\Desktop\project\node_modules\@angular\tsc-wrapped\src\tsc.js:31:15)
  at Tsc.typeCheck (D:\Users\User\Desktop\project\node_modules\@angular\tsc-wrapped\src\tsc.js:86:9)
  at D:\Users\User\User\project\node_modules\@angular\tsc-wrapped\src\main.js:33:23
  at process._tickCallback (internal/process/next_tick.js:103:7)
  at Module.runMain (module.js:592:11)
  at run (bootstrap_node.js:394:7)
  at startup (bootstrap_node.js:149:9)
  at bootstrap_node.js:509:3

Unfortunately, I cannot remove string from my constructor as I need it to extend the AngularFire class. Anyone know what the proper way to handle this error is?