I'm sure someone would be happy to advise if we get more information. A screenshot of the error would probably be a good start.
My best advice is : Please include more information.
Now I am guessing here but I gather this is an imported drawing
if you open incoming drawing.
Is it possible that you do not have the model that the drawing is looking for in the correct location so the drawing can find it? Is it possible that the custom properties that the title block is referencing are not in the model? Is this just with this one drawing or is it happening with all of the drawings you attempt to open? Has this drawing title block worked in the past? For this model or for other models?
Inquiring minds want to know.