No.Could there be a conflict while using both libraries?
Dim jTTS As JavaObject = TTS1 'not TTS
Sub btnSpeak_Click
Dim jTTS As JavaObject = TTS1
If jTTS.RunMethod("IsSpeaking", Null) = True Then 'this line is the error *-*
ToastMessageShow("Leitor em uso, aguarde!", True)
Else If EditText1.Text = "" Then
ToastMessageShow("O campo texto está vazio",True)
Else
EditText1.SelectAll
TTS1.Speak(EditText1.Text, True)
End If
End Sub