Engine fail (engine-blade didn´t move)

Hy guys,i´am new here at the forum and my englisch is not very good, but i have a big problem with the ngx!So: When i start my FSX i take the airberlin liverie and make a flight, but: When i want to change the liverie for excample the tuifly, the engines are on, but they didn´t move! I heared just the noise and what is missing in the engine. Here i have two pictures of the problem: I can make 100 % Throttle, the noise comes and the airplane starts taxiing, but the engine-blade didn´t move! I hope so that anybody can help me! Thank you