Compiler Error Message: CS0144: Cannot create an instance of the abstract class or interface 'SpeechLib.SpVoice'

This error occured after i hosted in somee.com. What is the error caused?
Line 37: if (Label7.Text == "Female") Line 38: { Line 39: SpVoice Voice = new SpVoice(); Line 40: Voice.Voice = Voice.GetVoices("gender=female").Item(0); Line 41: Voice.Speak(Labelhello.Text, SpeechVoiceSpeakFlags.SVSFlagsAsync);