For some reason I get this error message whenever a worker enters the game: TextError: Text [Workers:12] is too tall for a single line. Exceeds by 
You created dialog. Next you created item in dialog, where you show your text: "Workers + Convert Integer to Text".
My guess is that this message does not fit in length in the item. Try increasing the length of item.
Thank you for your reply, that is very kind of you. The strange thing is - I can't find any lenght of the item.. maybe I am blind?? O_o I upload images of the trigger here